Life
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This article is about life in general. For life on Earth, see Organism. For other meanings of "life", see Life (disambiguation).
For different meanings of related words, see Lives, Live, Live!, Living, Alive.
Life
Life on a rocky peak in the Waitakere Ranges
Scientific classification
(unranked):
Life (Biota)
Domains and Kingdoms
Life on Earth (Gaeabionta)
Nanobes ?
Nanobacterium ?
Acytota **?
Cytota
Bacteria *
Neomura
Archaea
Eukaryota
Bikonta
Apusozoa
Rhizaria
Excavata
Archaeplastida
Rhodophyta
Glaucophyta
Plantae
Heterokontophyta
Haptophyta
Cryptophyta
Alveolata
Unikonta
Amoebozoa
Opisthokonta
Choanozoa
Fungi
Animalia
Extraterrestrial life (hypothetical)
Life is a state that distinguishes organisms from non-living objects, such as non-life, and dead organisms, being manifested by growth through metabolism and reproduction. Some living things can communicate and many can adapt to their environment through changes originating internally. A physical characteristic of life is that it feeds on negative entropy.[1][2] In more detail, according to physicists such as John Bernal, Erwin Schrödinger, Eugene Wigner, and John Avery, life is a member of the class of phenomena which are open or continuous systems able to decrease their internal entropy at the expense of substances or free energy taken in from the environment and subsequently rejected in a degraded form (see: entropy and life).[3][4]
A diverse array of living organisms can be found in the biosphere on Earth. Properties common to these organisms—plants, animals, fungi, protists, archaea and bacteria—are a carbon- and water-based cellular form with complex organization and heritable genetic information. They undergo metabolism, possess a capacity to grow, respond to stimuli, reproduce and, through natural selection, adapt to their environment in successive generations.
An entity with the above properties is considered to be a living organism, that is an organism that is alive hence can be called a life form. However, not every definition of life considers all of these properties to be essential. For example, the capacity for descent with modification is often taken as the only essential property of life. This definition notably includes viruses, which do not qualify under narrower definitions as they are acellular and do not metabolize. Also, individual members of a species may not meet all the criteria, but are still considered alive, such as members of a reproducing species who are rendered unable to reprDefinitions
There is no universal definition of life; there are a variety of definitions proposed by different scientists. To define life in unequivocal terms is still a challenge for scientists.[5][6]
Conventional definition: Often scientists say that life is a characteristic of organisms that exhibit the following phenomena:
Homeostasis: Regulation of the internal environment to maintain a constant state; for example, sweating to reduce temperature.
Organization: Being composed of one or more cells, which are the basic units of life.
Metabolism: Consumption of energy by converting nonliving material into cellular components (anabolism) and decomposing organic matter (catabolism). Living things require energy to maintain internal organization (homeostasis) and to produce the other phenomena associated with life.
Growth: Maintenance of a higher rate of synthesis than catabolism. A growing organism increases in size in all of its parts, rather than simply accumulating matter. The particular species begins to multiply and expand as the evolution continues to flourish.
Adaptation: The ability to change over a period of time in response to the environment. This ability is fundamental to the process of evolution and is determined by the organism's heredity as well as the composition of metabolized substances, and external factors present.
Response to stimuli: A response can take many forms, from the contraction of a unicellular organism when touched to complex reactions involving all the senses of higher animals. A response is often expressed by motion, for example, the leaves of a plant turning toward the sun or an animal chasing its prey.
Reproduction: The ability to produce new organisms. Reproduction can be the division of one cell to form two new cells. Usually the term is applied to the production of a new individual (either asexually, from a single parent organism, or sexually, from at least two differing parent organisms), although strictly speaking it also describes the production of new cells in the process of growth.
Plant life.
Herds of zebra and impala gathering on the Masai Mara plain
Marine life around a coral reef.
However, others cite several limitations of this definition.[citation needed] Thus, many members of several species do not reproduce, possibly because they belong to specialized sterile castes (such as ant workers), these are still considered forms of life. One could say that the property of life is inherited; hence, sterile or hybrid organisms such as mules, ligers, and eunuchs are alive although they are not capable of self-reproduction. However, (a) The species as a whole does reproduce, (b) There are no cases of species where 100% of the individuals reproduce, and (c) specialized non-reproducing individuals of the species may still partially propagate their DNA or other master pattern through mechanisms such as kin selection.
Viruses and aberrant prion proteins are often considered replicators rather than forms of life, a distinction warranted because they cannot reproduce without very specialized substrates such as host cells or proteins, respectively. Also, the Rickettsia and Chlamydia are examples of bacteria that cannot independently fulfill many vital biochemical processes, and depend on entry, growth, and replication within the cytoplasm of eukaryotic host cells. However, most forms of life rely on foods produced by other species, or at least the specific chemistry of Earth's environment.
The systemic definition of life is that living things are self-organizing and autopoietic (self-producing). These objects are not to be confused with dissipative structures (e.g. fire).
Variations of this definition include Stuart Kauffman's definition of life as an autonomous agent or a multi-agent system capable of reproducing itself or themselves, and of completing at least one thermodynamic work cycle.
Proposed definitions of life include:
Living things are systems that tend to respond to changes in their environment, and inside themselves, in such a way as to promote their own continuation.[7]
Life (a living individual) is defined as a network of inferior negative feedbacks (regulatory mechanisms) subordinated to a superior positive feedback (potential of expansion, reproduction).[8]
Life is a characteristic of self-organizing, self-recycling systems consisting of populations of replicators that are capable of mutation, around most of which homeostatic, metabolizing organisms evolve.
Type of organization of matter producing various interacting forms of variable complexity, whose main property is to replicate almost perfectly by using matter and energy available in their environment to which they may adapt. In this definition "almost perfectly" relates to mutations happening during replication of organisms that may have adaptive benefits.
Life is a potentially self-perpetuating open system of linked organic reactions, catalyzed simultaneously and almost isothermally by complex chemicals (enzymes) that are themselves produced by the open system.
Origin of life
Main article: Origin of lifeFor religious beliefs about the creation of life, see creation myth.
An aerial photo of microbial mats around the Grand Prismatic Spring of Yellowstone National Park.
Although it has not been pinpointed exactly, evidence suggests that life on Earth has existed for about 3.7 billion years.[9]
There is no truly "standard" model for the origin of life, but most currently accepted scientific models build in one way or another on the following discoveries, which are listed roughly in order of postulated emergence:
Plausible pre-biotic conditions result in the creation of the basic small molecules of life. This was demonstrated in the Miller-Urey experiment, and in the work of Sidney Fox.
Phospholipids spontaneously form lipid bilayers, the basic structure of a cell membrane.
Procedures for producing random RNA molecules can produce ribozymes, which are able to produce more of themselves under very specific conditions.
The Panspermia hypothesis proposes that life originated elsewhere in the universe and was subsequently transferred to Earth perhaps via meteorites, comets or cosmic dust.
There are many different hypotheses regarding the path that might have been taken from simple organic molecules via pre-cellular life to protocells and metabolism. Many models fall into the "genes-first" category or the "metabolism-first" category, but a recent trend is the emergence of hybrid models that do not fit into either of these categories.[10]
Classification of life
Main article: Biological classification
The hierarchy of biological classification's major eight taxonomic ranks. Life is divided into domains, which are subdivided into further groups. Intermediate minor rankings are not shown.
Traditionally, people have divided organisms into the classes of plants and animals, based mainly on their ability of movement. The first known attempt to classify organisms, as per personal observations, was conducted by the Greek philosopher Aristotle.
He classified all living organisms known at that time as either a plant or an animal. Aristotle distinguished animals with blood from animals without blood (or at least without red blood), which can be compared with the concepts of vertebrates and invertebrates respectively. He divided the blooded animals into five groups: viviparous quadrupeds (mammals), birds, oviparous quadrupeds (reptiles and amphibians), fishes and whales. The bloodless animals were also divided into five groups: cephalopods, crustaceans, insects (which also included the spiders, scorpions, and centipedes, in addition to what we now define as insects), shelled animals (such as most molluscs and echinoderms) and "zoophytes". Though Aristotle's work in zoology was not without errors, it was the grandest biological synthesis of the time, and remained the ultimate authority for many centuries after his death. His observations on the anatomy of octopus, cuttlefish, crustaceans, and many other marine invertebrates are remarkably accurate, and could only have been made from first-hand experience with dissection.[11]
The exploration of parts of the New World produced large numbers of new plants and animals that needed descriptions and classification. The old systems made it difficult to study and locate all these new specimens within a collection and often the same plants or animals were given different names because the number of specimens were too large to memorize. A system was needed that could group these specimens together so they could be found, the binomial system was developed based on morphology with groups having similar appearances. In the latter part of the 16th century and the beginning of the 17th, careful study of animals commenced, which, directed first to familiar kinds, was gradually extended until it formed a sufficient body of knowledge to serve as an anatomical basis for classification.
Carolus Linnaeus is best known for his introduction of the method still used to formulate the scientific name of every species. Before Linnaeus, long many-worded names (composed of a generic name and a differentia specifica) had been used, but as these names gave a description of the species, they were not fixed. In his Philosophia Botanica (1751) Linnaeus took every effort to improve the composition and reduce the length of the many-worded names by abolishing unnecessary rhetorics, introducing new descriptive terms and defining their meaning with an unprecedented precision. In the late 1740s Linnaeus began to use a parallel system of naming species with nomina trivialia. Nomen triviale, a trivial name, was a single- or two-word epithet placed on the margin of the page next to the many-worded "scientific" name. The only rules Linnaeus applied to them was that the trivial names should be short, unique within a given genus, and that they should not be changed. Linnaeus consistently applied nomina trivialia to the species of plants in Species Plantarum (1st edn. 1753) and to the species of animals in the 10th edition of Systema Naturae (1758). By consistently using these specific epithets, Linnaeus separated nomenclature from taxonomy. Even though the parallel use of nomina trivialia and many-worded descriptive names continued until late in the eighteenth century, it was gradually replaced by the practice of using shorter proper names combined of the generic name and the trivial name of the species. In the nineteenth century, this new practice was codified in the first Rules and Laws of Nomenclature, and the 1st edn. of Species Plantarum and the 10th edn. of Systema Naturae were chosen as starting points for the Botanical and Zoological Nomenclature respectively. This convention for naming species is referred to as binomial nomenclature. Today, nomenclature is regulated by Nomenclature Codes, which allows names divided into ranks; separately for botany and for zoology. Whereas Linnaeus classified for ease of identification, it is now generally accepted that classification should reflect the Darwinian principle of common descent.
The Fungi have long been a problematic group in the biological classification: Originally, they were treated as plants. For a short period Linnaeus had placed them in the taxon Vermes in Animalia because he was misinformed: the hyphae were said to have been worms. He later placed them back in Plantae. Copeland classified the Fungi in his Protoctista, thus partially avoiding the problem but acknowledging their special status. The problem was eventually solved by Whittaker, when he gave them their own kingdom in his five-kingdom system. As it turned out, the fungi are more closely related to animals than to plants.
As new discoveries enabled us to study cells and microorganisms, new groups of life where revealed, and the fields of cell biology and microbiology were created. These new organisms were originally described separately in Protozoa as animals and Protophyta/Thallophyta as plants, but were united by Haeckel in his kingdom Protista, later the group of prokaryotes were split of in the kingdom Monera, eventually this kingdom would be divided in two separate groups, the Bacteria and the Archaea, leading to the six-kingdom system and eventually to the three-domain system. The 'remaining' protists would later be divided into smaller groups in clades in relation to more complex organisms. Thomas Cavalier-Smith, who has published extensively on the classification of protists, has recently proposed that the Neomura, the clade which groups together the Archaea and Eukarya, would have evolved from Bacteria, more precisely from Actinobacteria.
As microbiology, molecular biology and virology developed, non-cellular reproducing agents were discovered, sometimes these are considered to be alive and are treated in the domain of non-cellular life named Acytota or Aphanobionta, which are virus.
And thus all the primary taxonomical ranks were established: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species
Since the 1960s a trend called cladistics has emerged, arranging taxa in an evolutionary or phylogenetic tree. If a taxon includes all the descendants of some ancestral form, it is called monophyletic, as opposed to paraphyletic, groups based on traits which have evolved separately and where the most recent common ancestor is not included are called polyphyletic.
A new formal code of nomenclature, the PhyloCode, to be renamed "International Code of Phylogenetic Nomenclature" (ICPN), is currently under development, intended to deal with clades, which do not have set ranks, unlike conventional Linnaean taxonomy. It is unclear, should this be implemented, how the different codes will coexist.
Linnaeus17352 kingdoms
Haeckel1866[12]3 kingdoms
Chatton1937[13]2 empires
Copeland1956[14]4 kingdoms
Whittaker1969[15]5 kingdoms
Woese et al.1977[16]6 kingdoms
Woese et al.1990[17]3 domains
(not treated)
Protista
Prokaryota
Monera
Monera
Eubacteria
Bacteria
Archaebacteria
Archaea
Eukaryota
Protista
Protista
Protista
Eukarya
Vegetabilia
Plantae
Fungi
Fungi
Plantae
Plantae
Plantae
Animalia
Animalia
Animalia
Animalia
Animalia
Extraterrestrial life
Main articles: Extraterrestrial life and astrobiology
Earth is the only planet in the universe known to harbour life. The Drake equation has been used to estimate the probability of life elsewhere, but scientists disagree on many of the values of variables in this equation (although strictly speaking Drake equation estimates relate the number of extraterrestrial civilizations in our galaxy with which we might come in contact - not probability of life elsewhere). Depending on those values, the equation may either suggest that life arises frequently or infrequently. Drake himself estimated the number of civilizations in our galaxy with which we might expect to be able to communicate at any given time as equal to one.[citation needed]
Panspermia and exogenesis are theories proposing that life originated elsewhere in the universe and was subsequently transferred to Earth in the form of spores perhaps via meteorites, comets or cosmic dust. However those theories do not help explain the origin of this extraterrestrial life.
Sunday, September 28, 2008
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Monday, September 15, 2008
ENTRY 12
Friendship
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For other uses, see Friendship (disambiguation) and Friends (disambiguation).
Close relationships
Affinity · Attachment · Bonding · Boyfriend · Casual · Cohabitation · Compersion · Concubinage · Consort · Courtesan · Courtship · Divorce · Domestic partnership · Dower / Dowry / Bride price · Family · Friendship · Girlfriend · Husband · Infatuation · Intimacy · Jealousy · Limerence · Love · Marriage · Monogamy · Psychology of monogamy · Serial monogamy · Nonmonogamy · Passion · Pederasty · Platonic love · Polyamory · Polyfidelity · Polygamy · Relationship abuse · Relationship breakup · Romance · Romantic friendship · Separation · Sexuality · Same-sex relationship · Significant other · Soulmate · Teen dating violence · Wedding · Widowhood · Wife ·
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'Friendship' is a term used to denote co-operative and supportive behavior between two or more beings. In this sense, the term connotes a relationship which involves mutual knowledge, esteem, and affection and respect along with a degree of rendering service to friends in times of need or crisis. Friends will welcome each other's company and exhibit loyalty towards each other, often to the point of altruism. Their tastes will usually be similar and may converge, and they will share enjoyable activities. They will also engage in mutually helping behavior, such as exchange of advice and the sharing of hardship. A friend is someone who may often demonstrate reciprocating and reflective behaviors. Yet for many, friendship is nothing more than the trust that someone or something will not harm them. Value that is found in friendships is often the result of a friend demonstrating the following on a consistent basis:
the tendency to desire what is best for the other,
sympathy and empathy,
honesty, perhaps in situations where it may be difficult for others to speak the truth, especially in terms of pointing out the perceived faults of one's counterpart
mutual understanding.
Friends in Nazareth, Israel. Friendships are often the most important relationships in the emotional life of the adolescent, and are often more intense than relationships later in life.
In a comparison of personal relationships, friendship is considered to be closer than association, although there is a range of degrees of intimacy in both friendships and associations. Friendship and association can be thought of as spanning across the same continuum. The study of friendship is included in sociology, anthropology, philosophy, and zoology. Various theories of friendship have been proposed, among which are social psychology, social exchange theory, equity theory, relational dialectics, and attachment styles. See Interpersonal relationships
Friendship is considered one of the central human experiences, and has been sanctified by all major religions. The Epic of Gilgamesh, a Babylonian poem that is among the earliest known literary works in history, chronicles in great depth the friendship between Gilgamesh and Enkidu. The Greco-Roman had, as a paramount example, the friendship of Orestes and Pylades. The Abrahamic faiths have the story of David and Jonathan. Friendship played an important role in German Romanticism. A good example for this is Schiller's Die Bürgschaft. The Christian Gospels state that Jesus Christ declared, "No one has greater love than this, to lay down one's life for one's friends."(John 15:13).
In philosophy, Aristotle is known for his discussion (in the Nicomachean Ethics) of philia, which is usually (somewhat misleadingly) translated as "friendship," and certainly includes friendship, though is a much broader concept.
Cultural variations: (stub-section) A group of friends consists of two or more people who are in a mutually pleasing relationship engendering a sentiment of camaraderie, exclusivity, and mutual trust. There are varying degrees of "closeness" between friends. Hence, some people choose to differentiate and categorize friendships based on this sentiment.Rome
During the time of the Roman Empire, Cicero had his own beliefs on friendship. Cicero believed that in order to have a true friendship with someone there must be all honesty and truth. If there isn’t, then this isn’t a true friendship. In that case, friends must be one hundred percent honest with each other and put one hundred percent of their trust in the other person. Cicero also believed that for people to be friends with another person, they must do things without the expectation that their friend will have to repay them. He also believes that if a friend is about to do something wrong, and something that goes against your morals, you shouldn’t compromise your morals. You must explain why what they are going to do is wrong, and help them to see what the right thing to do is, because Cicero believes that ignorance is the cause of evil. Finally the last thing that Cicero believed was that the reason that a friendship comes to an end is because one person in that friendship has become bad. (On Friendship, Cicero)
[edit] Russia
The relationship is constructed differently in different cultures. In Russia, for example, one typically accords very few people the status of "friend". These friendships however make up in intensity what they lack in number. Friends are entitled to call each other by their first names alone, and to use diminutives. A norm of polite behaviour is addressing "acquaintances" by full first name plus patronymic. These could include relationships which elsewhere would be qualified as real friendships, such as workplace relationships of long standing, neighbors with whom one shares an occasional meal and visit, and so on. Physical contact between friends was expected, and friends, whether or not of the same sex, would embrace, sometimes kiss and walk in public with their arms around each other, or arm-in-arm, or hand-in-hand.
[edit] Asia
In the Middle East and Central Asia male friendships, while less restricted than in Russia, tend also to be reserved and respectable in nature. They tend to call friends by a shorter name or nick names.
[edit] Modern west
In the Western world, intimate physical contact has been sexualized in the public mind over the last one hundred years and is considered almost taboo in friendship, especially between two males. However, stylized hugging or kissing may be considered acceptable, depending on the context (see, for example, the kiss the tramp gives the kid in The Kid). In Spain and other Mediterranean countries men may embrace each other in public and kiss each other on the cheek. This is not limited solely to older generations but rather is present throughout all generations. In young children throughout the modern western world, friendship, usually of a homosocial nature, typically exhibits elements of a closeness and intimacy suppressed later in life in order to conform to societal standards.
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[edit] Decline of close friendships
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The examples and perspective in this article or section may not represent a worldwide view of the subject.Please improve this article or discuss the issue on the talk page.
The number and quality of friendships for the average American has been declining since at least 1985, according to a 2006 study.[1] The study states that 25% of Americans have no close confidants, and that the average total number of confidants per person has dropped to 2.
In recent times, some thinkers have postulated that modern friendships have lost the force and importance that they had in antiquity. C. S. Lewis for example, in his The Four Loves, writes:
"To the Ancients, Friendship seemed the happiest and most fully human of all loves; the crown of life and the school of virtue. The modern world, in comparison, ignores it. We admit of course that besides a wife and family a man needs a few 'friends'. But the very tone of the admission, and the sort of acquaintanceships which those who make it would describe as 'friendships', show clearly that what they are talking about has very little to do with that PhilÃa which Aristotle classified among the virtues or that Amicitia on which Cicero wrote a book."
Likewise, Paul Halsall claims that:
"The intense emotional and affective relationships described in the past as "non-sexual" cannot be said to exist today: modern heterosexual men can be buddies, but unless drunk they cannot touch each other, or regularly sleep together. They cannot affirm that an emotional affective relationship with another man is the centrally important relationship in their lives. It is not going too far, is it, to claim that friendship – if used to translate Greek philia or Latin amicitia – hardly exists among heterosexual men in modern Western society."
Mark McLelland, writing under his Buddhist name of Dharmachari Jñanavira (Article), more directly points to homophobia being at the root of a modern decline in the western tradition of friendship:
"Hence, in our cultural context where homosexual desire has for centuries been considered sinful, unnatural and a great evil, the experience of homoerotic desire can be very traumatic for some individuals and severely limit the potential for same-sex friendship. The Danish sociologist Henning Bech, for instance, writes of the anxiety which often accompanies developing intimacy between male friends:
"'The more one has to assure oneself that one's relationship with another man is not homosexual, the more conscious one becomes that it might be, and the more necessary it becomes to protect oneself against it. The result is that friendship gradually becomes impossible.'"
Their opinion that fear of being, or being seen as, homosexual has killed off western man's ability to form close friendships with other men is shared by Japanese psychologist Doi Takeo, who claims that male friendships in American society are fraught with homosexual anxiety and thus homophobia is a limiting factor stopping men from establishing deep friendships with other men.
The suggestion that friendship contains an ineluctable element of erotic desire is not new, but has been advanced by students of friendship ever since the time of the ancient Greeks, where it comes up in the writings of Plato. More recently, the Austrian philosopher Otto Weininger claimed that:
"There is no friendship between men that has not an element of sexuality in it, however little accentuated it may be in the nature of the friendship, and however painful the idea of the sexual element would be. But it is enough to remember that there can be no friendship unless there has been some attraction to draw the men together. Much of the affection, protection, and nepotism between men is due to the presence of unsuspected sexual compatibility." (Sex and Character, 1903)
Recent western scholarship in gender theory and feminism concurs, as reflected in the writings of Eve Sedgwick in her The Epistemology of the Closet, and Jonathan Dollimore in his Sexual Dissidence and Cultural Change: Augustine to Wilde, Freud to Foucault.
There is another theory for the decline of male friendship in Western societies. Modern Western men have grown up in smaller families. This means they had fewer siblings and, importantly, fewer brothers to play with younger or elder. After leaving the family nest for work, studies or other reasons, the sudden loss of brotherly friendships may be compensated by seeking more male friends. Men from smaller families will have less need to compensate, thus explaining the decline of male friendships later in life. This theory is particularly interesting because it does not require the obscure assumptions that all men must have homo-erotic desires to need male friends.
[edit] Developmental issues
This article does not cite any references or sources.Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed. (October 2008)
two friends
In the sequence of the emotional development of the individual, friendships come after parental bonding and before the pair bonding engaged in at the approach of maturity. In the intervening period between the end of early childhood and the onset of full adulthood, friendships are often the most important relationships in the emotional life of the adolescent, and are often more intense than relationships later in life[citation needed]. However making friends seems to trouble lots of people[citation needed]; having no friends can be emotionally damaging in some cases[citation needed]. Sometimes going years without a single friend can lead to suicide[citation needed]. A long time of friendship may also result in marriage, as they say[who?], too much friendship, is followed by a compromise.
A study by researchers from Purdue University found that post secondary education (e.g. university) friendships last longer than the friendships before it.[citation needed]
[edit] Types of friendship
Acquaintance
Romantic friendship
Soulmate
Pen pal
Internet friendship
Comrade
Friends with benefits
Boston marriage
Blood brotherhood
Companionate love
Intimate relationship
Love
Platonic love
Romantic love
Open relationship
Roommate
Spiritual
Invisible
[edit] Non-personal friendships
Although the term initially described relations between individuals, it is at times used for political purposes to describe relations between states or peoples ("the Franco-German friendship", for example), indicating in this case an affinity or mutuality of purpose between the two nations.
Regarding this aspect of international relations, Lord Palmerston said: "Therefore I say that it is a narrow policy to suppose that this country or that is to be marked out as the eternal ally or the perpetual enemy of England. We have no eternal allies, and we have no perpetual enemies. Our interests are eternal and perpetual, and those interests it is our duty to follow."[2] This is often paraphrased as: "Nations have no permanent friends and no permanent enemies. Only permanent interests."
The word "friendship" can be used in political speeches as an emotive modifier. Friendship in international relationships often refers to the quality of historical, existing, or anticipated bilateral relationships.
[edit] Interspecies friendship and animal friendship
Friendship as a type of interpersonal relationship is found also among animals with high intelligence, such as the higher mammals and some birds. Cross-species friendships are common between humans and domestic animals. Less common but noteworthy are friendships between an animal and another animal of a different species, such as a dog and cat.
See also: ethology, altruism in animals, sociobiology
[edit] Colloquial terms
A number of colloquial terms have been used to describe friendship and the context in which a friendship is fostered. These are briefly described below.
A friend who supports others only when it is easy and convenient to do so is called a "fair-weather friend". A friend who supports their own friends through emotional difficulties is a "true friend." This term also denotes a large degree of altruism, in that the true friend often sacrifices something of his or her own (usually their time and resources) in order to help the friend in need. True friends also are known to be very rare. A true friend may not be your best friend but someone who you know will be there for you. Friends who are sexually intimate but don't consider themselves to be dating is said to be a "casual relationship". This is also referred to as being "friends with benefits". A "best friend" is a friend to whom one feels closest. It is usually implied that the relationship is reciprocal, but such is not always the case, and best friend relationships can often be very complex.
[edit] Friendship contrasted with comradeship
Friendship can be mistaken for comradeship. Comradeship is the feeling of affinity that draws people together in time of war or when people have a mutual enemy or even a common goal. Former New York Times war correspondent Chris Hedges wrote: "We feel in wartime comradeship. We confuse this with friendship, with love. There are those, who will insist that the comradeship of war is love — the exotic glow that makes us in war feel as one people, one entity, is real, but this is part of war's intoxication. As this feeling dissipated in the weeks after the attack, there was a kind of nostalgia for its warm glow and wartime always brings with it this comradeship, which is the opposite of friendship. Friends are predetermined; friendship takes place between men and women who possess an intellectual and emotional affinity for each other. But comradeship – that ecstatic bliss that comes with belonging to the crowd in wartime – is within our reach. We can all have comrades." [1] As a war ends, or a common enemy recedes, comrades return to being strangers, who lack friendship and have little in common.
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Bold text
This article may require cleanup to meet Wikipedia's quality standards.Please improve this article if you can. (May 2008)
For other uses, see Friendship (disambiguation) and Friends (disambiguation).
Close relationships
Affinity · Attachment · Bonding · Boyfriend · Casual · Cohabitation · Compersion · Concubinage · Consort · Courtesan · Courtship · Divorce · Domestic partnership · Dower / Dowry / Bride price · Family · Friendship · Girlfriend · Husband · Infatuation · Intimacy · Jealousy · Limerence · Love · Marriage · Monogamy · Psychology of monogamy · Serial monogamy · Nonmonogamy · Passion · Pederasty · Platonic love · Polyamory · Polyfidelity · Polygamy · Relationship abuse · Relationship breakup · Romance · Romantic friendship · Separation · Sexuality · Same-sex relationship · Significant other · Soulmate · Teen dating violence · Wedding · Widowhood · Wife ·
This box: view • talk • edit
'Friendship' is a term used to denote co-operative and supportive behavior between two or more beings. In this sense, the term connotes a relationship which involves mutual knowledge, esteem, and affection and respect along with a degree of rendering service to friends in times of need or crisis. Friends will welcome each other's company and exhibit loyalty towards each other, often to the point of altruism. Their tastes will usually be similar and may converge, and they will share enjoyable activities. They will also engage in mutually helping behavior, such as exchange of advice and the sharing of hardship. A friend is someone who may often demonstrate reciprocating and reflective behaviors. Yet for many, friendship is nothing more than the trust that someone or something will not harm them. Value that is found in friendships is often the result of a friend demonstrating the following on a consistent basis:
the tendency to desire what is best for the other,
sympathy and empathy,
honesty, perhaps in situations where it may be difficult for others to speak the truth, especially in terms of pointing out the perceived faults of one's counterpart
mutual understanding.
Friends in Nazareth, Israel. Friendships are often the most important relationships in the emotional life of the adolescent, and are often more intense than relationships later in life.
In a comparison of personal relationships, friendship is considered to be closer than association, although there is a range of degrees of intimacy in both friendships and associations. Friendship and association can be thought of as spanning across the same continuum. The study of friendship is included in sociology, anthropology, philosophy, and zoology. Various theories of friendship have been proposed, among which are social psychology, social exchange theory, equity theory, relational dialectics, and attachment styles. See Interpersonal relationships
Friendship is considered one of the central human experiences, and has been sanctified by all major religions. The Epic of Gilgamesh, a Babylonian poem that is among the earliest known literary works in history, chronicles in great depth the friendship between Gilgamesh and Enkidu. The Greco-Roman had, as a paramount example, the friendship of Orestes and Pylades. The Abrahamic faiths have the story of David and Jonathan. Friendship played an important role in German Romanticism. A good example for this is Schiller's Die Bürgschaft. The Christian Gospels state that Jesus Christ declared, "No one has greater love than this, to lay down one's life for one's friends."(John 15:13).
In philosophy, Aristotle is known for his discussion (in the Nicomachean Ethics) of philia, which is usually (somewhat misleadingly) translated as "friendship," and certainly includes friendship, though is a much broader concept.
Cultural variations: (stub-section) A group of friends consists of two or more people who are in a mutually pleasing relationship engendering a sentiment of camaraderie, exclusivity, and mutual trust. There are varying degrees of "closeness" between friends. Hence, some people choose to differentiate and categorize friendships based on this sentiment.Rome
During the time of the Roman Empire, Cicero had his own beliefs on friendship. Cicero believed that in order to have a true friendship with someone there must be all honesty and truth. If there isn’t, then this isn’t a true friendship. In that case, friends must be one hundred percent honest with each other and put one hundred percent of their trust in the other person. Cicero also believed that for people to be friends with another person, they must do things without the expectation that their friend will have to repay them. He also believes that if a friend is about to do something wrong, and something that goes against your morals, you shouldn’t compromise your morals. You must explain why what they are going to do is wrong, and help them to see what the right thing to do is, because Cicero believes that ignorance is the cause of evil. Finally the last thing that Cicero believed was that the reason that a friendship comes to an end is because one person in that friendship has become bad. (On Friendship, Cicero)
[edit] Russia
The relationship is constructed differently in different cultures. In Russia, for example, one typically accords very few people the status of "friend". These friendships however make up in intensity what they lack in number. Friends are entitled to call each other by their first names alone, and to use diminutives. A norm of polite behaviour is addressing "acquaintances" by full first name plus patronymic. These could include relationships which elsewhere would be qualified as real friendships, such as workplace relationships of long standing, neighbors with whom one shares an occasional meal and visit, and so on. Physical contact between friends was expected, and friends, whether or not of the same sex, would embrace, sometimes kiss and walk in public with their arms around each other, or arm-in-arm, or hand-in-hand.
[edit] Asia
In the Middle East and Central Asia male friendships, while less restricted than in Russia, tend also to be reserved and respectable in nature. They tend to call friends by a shorter name or nick names.
[edit] Modern west
In the Western world, intimate physical contact has been sexualized in the public mind over the last one hundred years and is considered almost taboo in friendship, especially between two males. However, stylized hugging or kissing may be considered acceptable, depending on the context (see, for example, the kiss the tramp gives the kid in The Kid). In Spain and other Mediterranean countries men may embrace each other in public and kiss each other on the cheek. This is not limited solely to older generations but rather is present throughout all generations. In young children throughout the modern western world, friendship, usually of a homosocial nature, typically exhibits elements of a closeness and intimacy suppressed later in life in order to conform to societal standards.
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[edit] Decline of close friendships
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The examples and perspective in this article or section may not represent a worldwide view of the subject.Please improve this article or discuss the issue on the talk page.
The number and quality of friendships for the average American has been declining since at least 1985, according to a 2006 study.[1] The study states that 25% of Americans have no close confidants, and that the average total number of confidants per person has dropped to 2.
In recent times, some thinkers have postulated that modern friendships have lost the force and importance that they had in antiquity. C. S. Lewis for example, in his The Four Loves, writes:
"To the Ancients, Friendship seemed the happiest and most fully human of all loves; the crown of life and the school of virtue. The modern world, in comparison, ignores it. We admit of course that besides a wife and family a man needs a few 'friends'. But the very tone of the admission, and the sort of acquaintanceships which those who make it would describe as 'friendships', show clearly that what they are talking about has very little to do with that PhilÃa which Aristotle classified among the virtues or that Amicitia on which Cicero wrote a book."
Likewise, Paul Halsall claims that:
"The intense emotional and affective relationships described in the past as "non-sexual" cannot be said to exist today: modern heterosexual men can be buddies, but unless drunk they cannot touch each other, or regularly sleep together. They cannot affirm that an emotional affective relationship with another man is the centrally important relationship in their lives. It is not going too far, is it, to claim that friendship – if used to translate Greek philia or Latin amicitia – hardly exists among heterosexual men in modern Western society."
Mark McLelland, writing under his Buddhist name of Dharmachari Jñanavira (Article), more directly points to homophobia being at the root of a modern decline in the western tradition of friendship:
"Hence, in our cultural context where homosexual desire has for centuries been considered sinful, unnatural and a great evil, the experience of homoerotic desire can be very traumatic for some individuals and severely limit the potential for same-sex friendship. The Danish sociologist Henning Bech, for instance, writes of the anxiety which often accompanies developing intimacy between male friends:
"'The more one has to assure oneself that one's relationship with another man is not homosexual, the more conscious one becomes that it might be, and the more necessary it becomes to protect oneself against it. The result is that friendship gradually becomes impossible.'"
Their opinion that fear of being, or being seen as, homosexual has killed off western man's ability to form close friendships with other men is shared by Japanese psychologist Doi Takeo, who claims that male friendships in American society are fraught with homosexual anxiety and thus homophobia is a limiting factor stopping men from establishing deep friendships with other men.
The suggestion that friendship contains an ineluctable element of erotic desire is not new, but has been advanced by students of friendship ever since the time of the ancient Greeks, where it comes up in the writings of Plato. More recently, the Austrian philosopher Otto Weininger claimed that:
"There is no friendship between men that has not an element of sexuality in it, however little accentuated it may be in the nature of the friendship, and however painful the idea of the sexual element would be. But it is enough to remember that there can be no friendship unless there has been some attraction to draw the men together. Much of the affection, protection, and nepotism between men is due to the presence of unsuspected sexual compatibility." (Sex and Character, 1903)
Recent western scholarship in gender theory and feminism concurs, as reflected in the writings of Eve Sedgwick in her The Epistemology of the Closet, and Jonathan Dollimore in his Sexual Dissidence and Cultural Change: Augustine to Wilde, Freud to Foucault.
There is another theory for the decline of male friendship in Western societies. Modern Western men have grown up in smaller families. This means they had fewer siblings and, importantly, fewer brothers to play with younger or elder. After leaving the family nest for work, studies or other reasons, the sudden loss of brotherly friendships may be compensated by seeking more male friends. Men from smaller families will have less need to compensate, thus explaining the decline of male friendships later in life. This theory is particularly interesting because it does not require the obscure assumptions that all men must have homo-erotic desires to need male friends.
[edit] Developmental issues
This article does not cite any references or sources.Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed. (October 2008)
two friends
In the sequence of the emotional development of the individual, friendships come after parental bonding and before the pair bonding engaged in at the approach of maturity. In the intervening period between the end of early childhood and the onset of full adulthood, friendships are often the most important relationships in the emotional life of the adolescent, and are often more intense than relationships later in life[citation needed]. However making friends seems to trouble lots of people[citation needed]; having no friends can be emotionally damaging in some cases[citation needed]. Sometimes going years without a single friend can lead to suicide[citation needed]. A long time of friendship may also result in marriage, as they say[who?], too much friendship, is followed by a compromise.
A study by researchers from Purdue University found that post secondary education (e.g. university) friendships last longer than the friendships before it.[citation needed]
[edit] Types of friendship
Acquaintance
Romantic friendship
Soulmate
Pen pal
Internet friendship
Comrade
Friends with benefits
Boston marriage
Blood brotherhood
Companionate love
Intimate relationship
Love
Platonic love
Romantic love
Open relationship
Roommate
Spiritual
Invisible
[edit] Non-personal friendships
Although the term initially described relations between individuals, it is at times used for political purposes to describe relations between states or peoples ("the Franco-German friendship", for example), indicating in this case an affinity or mutuality of purpose between the two nations.
Regarding this aspect of international relations, Lord Palmerston said: "Therefore I say that it is a narrow policy to suppose that this country or that is to be marked out as the eternal ally or the perpetual enemy of England. We have no eternal allies, and we have no perpetual enemies. Our interests are eternal and perpetual, and those interests it is our duty to follow."[2] This is often paraphrased as: "Nations have no permanent friends and no permanent enemies. Only permanent interests."
The word "friendship" can be used in political speeches as an emotive modifier. Friendship in international relationships often refers to the quality of historical, existing, or anticipated bilateral relationships.
[edit] Interspecies friendship and animal friendship
Friendship as a type of interpersonal relationship is found also among animals with high intelligence, such as the higher mammals and some birds. Cross-species friendships are common between humans and domestic animals. Less common but noteworthy are friendships between an animal and another animal of a different species, such as a dog and cat.
See also: ethology, altruism in animals, sociobiology
[edit] Colloquial terms
A number of colloquial terms have been used to describe friendship and the context in which a friendship is fostered. These are briefly described below.
A friend who supports others only when it is easy and convenient to do so is called a "fair-weather friend". A friend who supports their own friends through emotional difficulties is a "true friend." This term also denotes a large degree of altruism, in that the true friend often sacrifices something of his or her own (usually their time and resources) in order to help the friend in need. True friends also are known to be very rare. A true friend may not be your best friend but someone who you know will be there for you. Friends who are sexually intimate but don't consider themselves to be dating is said to be a "casual relationship". This is also referred to as being "friends with benefits". A "best friend" is a friend to whom one feels closest. It is usually implied that the relationship is reciprocal, but such is not always the case, and best friend relationships can often be very complex.
[edit] Friendship contrasted with comradeship
Friendship can be mistaken for comradeship. Comradeship is the feeling of affinity that draws people together in time of war or when people have a mutual enemy or even a common goal. Former New York Times war correspondent Chris Hedges wrote: "We feel in wartime comradeship. We confuse this with friendship, with love. There are those, who will insist that the comradeship of war is love — the exotic glow that makes us in war feel as one people, one entity, is real, but this is part of war's intoxication. As this feeling dissipated in the weeks after the attack, there was a kind of nostalgia for its warm glow and wartime always brings with it this comradeship, which is the opposite of friendship. Friends are predetermined; friendship takes place between men and women who possess an intellectual and emotional affinity for each other. But comradeship – that ecstatic bliss that comes with belonging to the crowd in wartime – is within our reach. We can all have comrades." [1] As a war ends, or a common enemy recedes, comrades return to being strangers, who lack friendship and have little in common.
ENTRY 11
Mobile phone
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"Cell phone" redirects here. For the movie, see Cell Phone (film).
Several examples of non-flip mobile phones.
A mobile phone (also known as a wireless phone or cellular phone[1]) is a short-range, electronic device used for mobile voice or data communication over a network of specialised base stations known as cell sites. In addition to the standard voice function of a mobile phone, telephone, current mobile phones may support many additional services, and accessories, such as SMS for text messaging, email, packet switching for access to the Internet, gaming, bluetooth, infrared, camera with video recorder and MMS for sending and receiving photos and video. Most current mobile phones connect to a cellular network of base stations (cell sites), which is in turn interconnected to the public switched telephone network (PSTN) (the exception is satellite phones).Overview
According to internal memos, American Telephone & Telegraph discussed developing a wireless phone in 1915, but were afraid deployment of the technology could undermine its monopoly on wired service in the U.S.[2]
The first commercial mobile phone service was launched in Japan by NTT in 1978. By November 2007, the total number of mobile phone subscriptions in the world had reached 3.3 billion, or half of the human population (although some users have multiple subscriptions, or inactive subscriptions), which also makes the mobile phone the most widely spread technology and the most common electronic device in the world.[3]
The first mobile phone to enable internet connectivity and wireless email, the Nokia Communicator, was released in 1996, creating a new category of multi-use devices called smartphones. In 1999 the first mobile internet service was launched by NTT DoCoMo in Japan under the i-Mode service. By 2007 over 798 million people around the world accessed the internet or equivalent mobile internet services such as WAP and i-Mode at least occasionally using a mobile phone rather than a personal computer.
[edit] Cellular systems
See also: Cellular frequencies
Mobile phone tower
Mobile phones send and receive radio signals with any number of cell site base stations fitted with microwave antennas. These sites are usually mounted on a tower, pole or building, located throughout populated areas, then connected to a cabled communication network and switching system. The phones have a low-power transceiver that transmits voice and data to the nearest cell sites, normally not more than 8 to 13 km (approximately 5 to 8 miles) away.
When the mobile phone or data device is turned on, it registers with the mobile telephone exchange, or switch, with its unique identifiers, and can then be alerted by the mobile switch when there is an incoming telephone call. The handset constantly listens for the strongest signal being received from the surrounding base stations, and is able to switch seamlessly between sites. As the user moves around the network, the "handoffs" are performed to allow the device to switch sites without interrupting the call.
Cell sites have relatively low-power (often only one or two watts) radio transmitters which broadcast their presence and relay communications between the mobile handsets and the switch. The switch in turn connects the call to another subscriber of the same wireless service provider or to the public telephone network, which includes the networks of other wireless carriers. Many of these sites are camouflaged to blend with existing environments, particularly in scenic areas.
The dialogue between the handset and the cell site is a stream of digital data that includes digitised audio (except for the first generation analog networks). The technology that achieves this depends on the system which the mobile phone operator has adopted. The technologies are grouped by generation. The first-generation systems started in 1979 with Japan, are all analog and include AMPS and NMT. Second-generation systems, started in 1991 in Finland, are all digital and include GSM, CDMA and TDMA.
The nature of cellular technology renders many phones vulnerable to 'cloning': anytime a cell phone moves out of coverage (for example, in a road tunnel), when the signal is re-established, the phone sends out a 're-connect' signal to the nearest cell-tower, identifying itself and signalling that it is again ready to transmit. With the proper equipment, it's possible to intercept the re-connect signal and encode the data it contains into a 'blank' phone -- in all respects, the 'blank' is then an exact duplicate of the real phone and any calls made on the 'clone' will be charged to the original account.
Third-generation (3G) networks, which are still being deployed, began in Japan in 2001. They are all digital, and offer high-speed data access in addition to voice services and include W-CDMA (known also as UMTS), and CDMA2000 EV-DO. China will launch a third generation technology on the TD-SCDMA standard. Operators use a mix of predesignated frequency bands determined by the network requirements and local regulations.
In an effort to limit the potential harm from having a transmitter close to the user's body, the first fixed/mobile cellular phones that had a separate transmitter, vehicle-mounted antenna, and handset (known as car phones and bag phones) were limited to a maximum 3 watts Effective Radiated Power. Modern handheld cellphones which must have the transmission antenna held inches from the user's skull are limited to a maximum transmission power of 0.6 watts ERP. Regardless of the potential biological effects, the reduced transmission range of modern handheld phones limits their usefulness in rural locations as compared to car/bag phones, and handhelds require that cell towers be spaced much closer together to compensate for their lack of transmission power.
Some handhelds include an optional auxiliary antenna port on the back of the phone, which allows it to be connected to a large external antenna and a 3 watt cellular booster. Alternately in fringe-reception areas, a cellular repeater may be used, which uses a long distance high-gain dish antenna or yagi antenna to communicate with a cell tower far outside of normal range, and a repeater to rebroadcast on a small short-range local antenna that allows any cellphone within a few meters to function properly.
[edit] Handsets
Nokia is currently the world's largest manufacturer of mobile phones, with a global device market share of approximately 40% in 2008. Other major mobile phone manufacturers (in order of market share) include Samsung (14%), Motorola (14%), Sony Ericsson (9%) and LG (7%).[4] These manufacturers account for over 80% of all mobile phones sold and produce phones for sale in most countries.
Other manufacturers include Apple Inc., Audiovox (now UTStarcom), Benefon, BenQ-Siemens, CECT, High Tech Computer Corporation (HTC), Fujitsu, Kyocera, Mitsubishi Electric, NEC, Neonode, Panasonic (Matsushita Electric), Pantech Curitel, Philips, Research In Motion, Sagem, Sanyo, Sharp, Siemens, Sendo, Sierra Wireless, SK Teletech, Sonim Technologies, T&A Alcatel, Huawei, Trium and Toshiba. There are also specialist communication systems related to (but distinct from) mobile phones.
There are several categories of mobile phones, from basic phones to feature phones such as musicphones and cameraphones, to smartphones. The first smartphone was the Nokia 9000 Communicator in 1996 which incorporated PDA functionality to the basic mobile phone at the time. As miniaturisation and increased processing power of microchips has enabled ever more features to be added to phones, the concept of the smartphone has evolved, and what was a high-end smartphone five years ago, is a standard phone today. Several phone series have been introduced to address a given market segment, such as the RIM Blackberry focusing on enterprise/corporate customer email needs; the SonyEricsson Walkman series of musicphones and Cybershot series of cameraphones; the Nokia N-Series of multimedia phones; and the Apple iPhone which provides full-featured web access and multimedia capabilities.
Main article: Mobile phone features
Mobile phones often have features beyond sending text messages and making voice calls, including Internet browsing, music (MP3) playback, memo recording, personal organiser functions, e-mail, instant messaging, built-in cameras and camcorders, ringtones, games, radio, Push-to-Talk (PTT), infrared and Bluetooth connectivity, call registers, ability to watch streaming video or download video for later viewing, video calling and serve as a wireless modem for a PC, and soon will also serve as a console of sorts to online games and other high quality games. The total value of mobile data services exceeds the value of paid services on the Internet, and was worth 31 billion dollars in 2006 (source Informa).[citation needed] The largest categories of mobile services are music, picture downloads, videogaming, adult entertainment, gambling, video/TV.
[edit] Applications
The most commonly used data application on mobile phones is SMS text messaging, with 74% of all mobile phone users as active users (over 2.4 billion out of 3.3 billion total subscribers at the end of 2007). SMS text messaging was worth over 100 billion dollars in annual revenues in 2007 and the worldwide average of messaging use is 2.6 SMS sent per day per person across the whole mobile phone subscriber base. (source Informa 2007). The first SMS text message was sent from a computer to a mobile phone in 1992 in the UK, while the first person-to-person SMS from phone to phone was sent in Finland in 1993.
The other non-SMS data services used by mobile phones were worth 31 Billion dollars in 2007, and were led by mobile music, downloadable logos and pictures, gaming, gambling, adult entertainment and advertising (source: Informa 2007). The first downloadable mobile content was sold to a mobile phone in Finland in 1998, when Radiolinja (now Elisa) introduced the downloadable ringing tone service. In 1999 Japanese mobile operator NTT DoCoMo introduced its mobile internet service, i-Mode, which today is the world's largest mobile internet service and roughly the same size as Google in annual revenues.
The first mobile news service, delivered via SMS, was launched in Finland in 2000. Mobile news services are expanding with many organisations providing "on-demand" news services by SMS. Some also provide "instant" news pushed out by SMS. Mobile telephony also facilitates activism and public journalism being explored by Reuters and Yahoo![5] and small independent news companies such as Jasmine News in Sri Lanka.
Companies like Monster are starting to offer mobile services such as job search and career advice. Consumer applications are on the rise and include everything from information guides on local activities and events to mobile coupons and discount offers one can use to save money on purchases. Even tools for creating websites for mobile phones are increasingly becoming available, e.g. Mobilemo.
Mobile payments were first trialled in Finland in 1998 when two coca cola machines in Espoo were enabled to work with SMS payments. Eventually the idea spread and in 1999 the Philippines launched the first commercial mobile payments systems, on the mobile operators Globe and Smart. Today mobile payments ranging from mobile banking to mobile credit cards to mobile commerce are very widely used in Asia and Africa, and in selected European markets. For example in the Philippines it is not unusual to have your whole paycheck paid to the mobile account. In Kenya the limit of money transfers from one mobile banking account to another is one million US dollars. In India paying utility bills with mobile gains a 5% discount. In Estonia the government found criminals collecting cash parking fees, so the government declared that only mobile payments via SMS were valid for parking and today all parking fees in Estonia are handled via mobile and the crime involved in the activity has vanished.
Mobile Applications are developed using the Six M's (previously Five M's) service-development theory created by the author Tomi Ahonen with Joe Barrett of Nokia and Paul Golding of Motorola. The Six M's are Movement (location), Moment (time), Me (personalisation), Multi-user (community), Money (payments) and Machines (automation). The Six M's / Five M's theory is widely referenced in the telecoms applications literature and used by most major industry players. The first book to discuss the theory was Services for UMTS by Ahonen & Barrett in 2002.
The availability of mobile phone backup applications is growing with the increasing amount of mobile phone data being stored on mobile phones today. With mobile phone manufacturers producing mobile handsets with more and more memory storage capabilities the awareness of the importance in backing up mobile phone data is increasing. Corporate mobile phone users today keep very important company information on their mobiles, information if lost then not easily replaced. Wireless backup applications like SC BackUp offer users the chance to backup mobile phone data using advanced wireless technology. Users can backup, restore or transfer mobile data anytime, anywhere all over the world, to a secured server.
Other common applications include diaries, timers, chronometers, games, ...
[edit] Media
The mobile phone became a mass media channel in 1998 when the first ringing tones were sold to mobile phones by Radiolinja in Finland. Soon other media content appeared such as news, videogames, jokes, horoscopes, TV content and advertising. In 2006 the total value of mobile phone paid media content exceeded internet paid media content and was worth 31 Billion dollars (source Informa 2007). The value of music on phones was worth 9.3 Billion dollars in 2007 and gaming was worth over 5 billion dollars in 2007 (source Netsize Guide 2008 [1]).
The mobile phone is often called the Fourth Screen (if counting cinema, TV and PC screens as the first three) or Third Screen (counting only TV and PC screens). It is also called the Seventh of the Mass Media (with Print, Recordings, Cinema, Radio, TV and Internet the first six). Most early content for mobile tended to be copies of legacy media, such as the banner advertisement or the TV news highlight video clip. Recently unique content for mobile has been emerging, from the ringing tones and ringback tones in music to "mobisodes," video content that has been produced exclusively for mobile phones.
The advent of media on the mobile phone has also produced the opportunity to identify and track Alpha Users or Hubs, the most influential members of any social community. AMF Ventures measured in 2007 the relative accuracy of three mass media, and found that audience measures on mobile were nine times more accurate than on the internet and 90 times more accurate than on TV.
[edit] Power supply
Mobile phones generally obtain power from batteries, which can be recharged from a USB port, from portable batteries, from mains power or a cigarette lighter socket in a car using an adapter (often called battery charger or wall wart) or from a solar panel or a dynamo (that can also use a USB port to plug the phone).
Formerly, the most common form of mobile phone batteries were nickel metal-hydride, as they have a low size and weight. Lithium-Ion batteries are sometimes used, as they are lighter and do not have the voltage depression that nickel metal-hydride batteries do. Many mobile phone manufacturers have now switched to using lithium-Polymer batteries as opposed to the older Lithium-Ion, the main advantages of this being even lower weight and the possibility to make the battery a shape other than strict cuboid. Mobile phone manufacturers have been experimenting with alternative power sources, including solar cells.
[edit] SIM card
In addition to the battery, most cellphones require a small microchip, called a Subscriber Identity Module or SIM Card, to function. Approximately the size of a small postage stamp, the SIM Card is usually placed underneath the battery in the rear of the unit, and (when properly activated) stores the phone's configuration data, and information about the phone itself, such as which calling plan the subscriber is using. When the subscriber removes the SIM Card, it can be re-inserted into another phone and used as normal.
Each SIM Card is activated by use of a unique numerical identifier; once activated, the identifier is locked down and the card is permanently locked in to the activating network. For this reason, most retailers refuse to accept the return of an activated SIM Card.
Those cell phones that do not use a SIM Card have the data programmed in to their memory. This data is accessed by using a special digit sequence to access the "NAM" as in "Name" or number programming menu. From here, one can add information such as a new number for your phone, new Service Provider numbers, new emergency numbers, change their Authentication Key or A-Key code, and update their Preferred Roaming List or PRL. However, to prevent the average Joe from totally disabling their phone or removing it from the network, the Service Provider puts a lock on this data called a Master Subsidiary Lock or MSL.
The MSL also ensures that the Service Provider gets payment for the phone that was purchased or "leased". For example, the Motorola Razr V9C costs upwards of CAD $500. You can get one from Bell Mobility for approximately $200. The difference is paid by the customer in the form of a monthly bill. If, in this case, Bell Mobility did not use a MSL, then they may lose the $300–$400 difference that is paid in the monthly bill, since some customers would cancel their service and take the phone to another carrier such as Telus, or Verizon. This would eventually put the carrier or in this case, Bell Mobility out of business.
[edit] Usage
[edit] By civilians
This Railfone found on some Amtrak trains in North America uses cellular technology.
See also: List of mobile network operators
An increasing number of countries, particularly in Europe, now have more mobile phones than people. According to the figures from Eurostat, the European Union's in-house statistical office, Luxembourg had the highest mobile phone penetration rate at 158 mobile subscriptions per 100 people (158%), closely followed by Lithuania and Italy.[6] In Hong Kong the penetration rate reached 139.8% of the population in July 2007.[7] Over 50 countries have mobile phone subscription penetration rates higher than that of the population and the Western European average penetration rate was 110% in 2007 (source Informa 2007). The U.S. currently has one of the lowest rates of mobile phone penetrations in the industrialised world at 85%.
There are over five hundred million active mobile phone accounts in China, as of 2007, but the total penetration rate there still stands below 50%.[8] The total number of mobile phone subscribers in the world was estimated at 2.14 billion in 2005.[9] The subscriber count reached 2.7 billion by end of 2006 according to Informa[citation needed], and 3.3 billion by November, 2007[3], thus reaching an equivalent of over half the planet's population. Around 80% of the world's population has access to mobile phone coverage, as of 2006. This figure is expected to increase to 90% by the year 2010.[10]
In some developing countries with little "landline" telephone infrastructure, mobile phone use has quadrupled in the last decade.[11] The rise of mobile phone technology in developing countries is often cited as an example of the leapfrog effect. Many remote regions in the third world went from having no telecommunications infrastructure to having satellite based communications systems. At present, Africa has the largest growth rate of cellular subscribers in the world,[12] its markets expanding nearly twice as fast as Asian markets.[13] The availability of prepaid or 'pay-as-you-go' services, where the subscriber is not committed to a long term contract, has helped fuel this growth in Africa as well as in other continents.
On a numerical basis, India is the largest growth market, adding about 6 million mobile phones every month.[14] With 256.55 million total landline and mobile phones, market penetration in the country is still low at 22.52%. India expects to reach 500 million subscribers by end of 2010. Simultaneously, landline phone ownership is decreasing gradually and accounts for approximately 40 million connections.
There are three major technical standards for the current generation of mobile phones and networks, and two major standards for the next generation 3G phones and networks. All European and African countries and many Asian countries have adopted a single system, GSM, which is the only technology available on all continents and in most countries and covers over 74% of all subscribers on mobile networks. In many countries, such as the United States, Australia, Brazil, Canada, Costa Rica, India, and South Korea and Vietnam GSM co-exists with other internationally adopted standards such as CDMA and TDMA, as well as national standards such as iDEN in the USA and PDC in Japan. Over the past five years several dozen mobile operators (carriers) have abandoned networks on TDMA and CDMA technologies, switching over to GSM.
With third generation (3G) networks, which are also known as IMT-2000 networks, about three out of four networks are on the W-CDMA (also known as UMTS) standard, usually seen as the natural evolution path for GSM and TDMA networks. One in four 3G networks is on the CDMA2000 1x EV-DO technology. Some analysts count a previous stage in CDMA evolution, CDMA2000 1x RTT, as a 3G technology whereas most standardization experts count only CDMA2000 1x EV-DO as a true 3G technology. Because of this difference in interpreting what is 3G, there is a wide variety in subscriber counts. As of June 2007, on the narrow definition there are 200 million subscribers on 3G networks. By using the more broad definition, the total subscriber count of 3G phone users is 475 million.
[edit] Culture and customs
Between the 1980s and the 2000s, the mobile phone has gone from being an expensive item used by the business elite to a pervasive, personal communications tool for the general population. In most countries, mobile phones outnumber land-line phones, with fixed landlines numbering 1.3 Billion but mobile subscriptions 3.3 Billion at the end of 2007.
In many markets from Japan and South Korea, to Scandinavia, to Malaysia, Singapore, Taiwan and Hong Kong, most children age 8-9 have mobile phones and the new accounts are now opened for customers aged 6 and 7. Where mostly parents tend to give hand-me-down used phones to their youngest children, in Japan already new cameraphones are on the market whose target age group is under 10 years of age, introduced by KDDI in February 2007. The USA also lags on this measure, as in the US so far, about half of all children have mobile phones.[15] In many young adults' households it has supplanted the land-line phone. Mobile phone usage is banned in some countries, such as North Korea and restricted in some other countries such as Burma.[16]
Given the high levels of societal mobile phone service penetration, it is a key means for people to communicate with each other. The SMS feature spawned the "texting" sub-culture amongst younger users. In December 1993, the first person-to-person SMS text message was transmitted in Finland. Currently, texting is the most widely-used data service; 1.8 billion users generated $80 billion of revenue in 2006 (source ITU). Many phones offer Instant Messenger services for simple, easy texting. Mobile phones have Internet service (e.g. NTT DoCoMo's i-mode), offering text messaging via e-mail in Japan, South Korea, China, and India. Most mobile internet access is much different from computer access, featuring alerts, weather data, e-mail, search engines, instant messages, and game and music downloading; most mobile internet access is hurried and short.
The mobile phone can be a fashion totem custom-decorated to reflect the owner's personality.[17] This aspect of the mobile telephony business is, in itself, an industry, e.g. ringtone sales amounted to $3.5 billion in 2005.[18]
The use of a mobile phone is prohibited in some train company carriages
Mobile phone use can be an important matter of social discourtesy: phones ringing during funerals or weddings; in toilets, cinemas and theatres. Some book shops, libraries, bathrooms, cinemas, doctors' offices and places of worship prohibit their use, so that other patrons will not be disturbed by conversations. Some facilities install signal-jamming equipment to prevent their use, although in many countries, including the US, such equipment is illegal. Some new auditoriums have installed wire mesh in the walls to make a Faraday cage, which prevents signal penetration without violating signal jamming laws.[citation needed]
Trains, particularly those involving long-distance services, often offer a "quiet carriage" where phone use is prohibited, much like the designated non-smoking carriage of the past. In the UK however many users tend to ignore this as it is rarely enforced, especially if the other carriages are crowded and they have no choice but to go in the "quiet carriage".[citation needed] In Japan, it is generally considered impolite to talk using a phone on any train -- texting is generally the mode of mobile communication. Mobile phone usage on local public transport is also increasingly seen as a nuisance; the city of Graz, for instance, has mandated a total ban of mobile phones on its tram and bus network in 2008 (though texting is still allowed).[19][20]
Mobile phone use on aircraft is also prohibited and many airlines claim in their in-plane announcements that this prohibition is due to possible interference with aircraft radio communications. Shut-off mobile phones do not interfere with aircraft avionics; the concern is partially based on the crash of Crossair Flight 498.
[edit] By government agencies
[edit] Law enforcement
Main article: Lawful interception
Law enforcement have used mobile phone evidence in a number of different ways. In the EU the "communications of every mobile telephone user are recorded".[21] In other countries, evidence about the physical location of an individual at a given time has been introduced by triangulating the individual's cellphone between several cellphone towers. This triangulation technique can be used to show that an individual's cellphone was at a certain location at a certain time. The concerns over terrorism and terrorist use of technology prompted an inquiry by the British House of Commons Home Affairs Select Committee into the use of evidence from mobile phone devices, prompting leading mobile telephone forensic specialists to identify forensic techniques available in this area.[22] NIST have published guidelines and procedures for the preservation, acquisition, examination, analysis, and reporting of digital information present on mobile phones can be found under the NIST Publication SP800-101.[23]
In the UK in 2000 it was claimed that recordings of mobile phone conversations made on the day of the Omagh bombing were crucial to the police investigation. In particular, calls made on two mobile phones which were tracked from south of the Irish border to Omagh and back on the day of the bombing, were considered of vital importance.[24]
Further example of criminal investigations using mobile phones is the initial location and ultimate identification of the terrorists of the 2004 Madrid train bombings. In the attacks, mobile phones had been used to detonate the bombs. However, one of the bombs failed to detonate, and the SIM card in the corresponding mobile phone gave the first serious lead about the terrorists to investigators. By tracking the whereabouts of the SIM card and correlating other mobile phones that had been registered in those areas, police were able to locate the terrorists.[25]
[edit] Disaster response
The Finnish government decided in 2005 that the fastest way to warn citizens of disasters was the mobile phone network. In Japan, mobile phone companies provide immediate notification of earthquakes and other natural disasters to their customers free of charge [26]. In the event of an emergency, disaster response crews can locate trapped or injured people using the signals from their mobile phones. An interactive menu accessible through the phone's Internet browser notifies the company if the user is safe or in distress.[citation needed] In Finland rescue services suggest hikers carry mobile phones in case of emergency even when deep in the forests beyond cellular coverage, as the radio signal of a cellphone attempting to connect to a base station can be detected by overflying rescue aircraft with special detection gear. Also, users in the United States can sign up through their provider for free text messages when an AMBER Alert goes out for a missing person in their area.
However, most mobile phone networks operate close to capacity during normal times and spikes in call volumes caused by widespread emergencies often overload the system just when it is needed the most. Examples reported in the media where this have occurred include the September 11, 2001 attacks, the Hawaiian earthquake, the 2003 Northeast blackouts, the 2005 London Tube bombings, Hurricane Katrina, and the 2007 Minnesota bridge collapse. Thus mobile phones are better for isolated emergencies such as vehicle accidents.
Under FCC regulations, all mobile telephones must be capable of dialing emergency services, regardless of the presence of a SIM card or the payment status of the account.
[edit] Business models
[edit] Tariff models
See also: GSM services#Voice charges
When cellular telecoms services were launched, phones and calls were very expensive and early mobile operators (carriers) decided to charge for all air time consumed by the mobile phone user. This resulted in the concept of charging callers for outbound calls and also for receiving calls. As mobile phone call charges diminished and phone adoption rates skyrocketed, more modern operators decided not to charge for incoming calls. Thus some markets have "Receiving Party Pays" models (also known as "Mobile Party Pays"), in which both outbound and received calls are charged, and other markets have "Calling Party Pays" models, by which only making calls produces costs, and receiving calls is free. An exception to this is international roaming tariffs, by which receiving calls are normally also charged.[citation needed]
The European market adopted a "Calling Party Pays" model throughout the GSM environment and soon various other GSM markets also started to emulate this model. As Receiving Party Pays systems have the undesired effect of phone owners keeping their phones turned off to avoid receiving unwanted calls, the total voice usage rates (and profits) in Calling Party Pays countries outperform those in Receiving Party Pays countries. Consequently, most countries previously with Receiving Party Pays models have either abandoned them or employed alternative marketing methods, such as massive voice call buckets, to avoid the problem of phone users keeping phones turned off.[citation needed]
In most countries today, the person receiving a mobile phone call pays nothing. However, in Hong Kong, Canada, and the United States, one can be charged per minute, for incoming as well as outgoing calls. In the United States and Canada, a few carriers are beginning to offer unlimited received phone calls. For the Chinese mainland, it was reported that both of its two operators will adopt the caller-pays approach as early as January 2007.[27]
While some systems of payment are 'pay-as-you-go' where conversation time is purchased and added to a phone unit via an Internet account or in shops or ATMs, other systems are more traditional ones where bills are paid by regular intervals. Pay as you go (also known as "pre-pay") accounts were invented simultaneously in Portugal and Italy and today form more than half of all mobile phone subscriptions. USA, Canada, Costa Rica, Japan and Finland are among the rare countries left where most phones are still contract-based.
One possible alternative is a sim-lock free mobile phone. Sim-lock free mobile phones allow portability between networks so users can use sim cards from various networks and not need to have their phone unlocked.
[edit] Impacts
[edit] Human health and behaviour
Main article: Mobile phone radiation and health
Since the introduction of mobile phones, concerns (both scientific and public) have been raised about the potential health impacts from regular use.[28] But by 2008, American mobile phones transmitted and received more text messages than phone calls.[29] Numerous studies have reported no significant relationship between mobile phone use and health, but the effect of mobile phone usage on health continues to be an area of public concern.
For example, at the request of some of their customers, Verizon created usage controls that meter service and can switch phones off, so that children could get some sleep.[29] Other users that some people are working on limiting include persons operating moving trains or automobiles, coaches when writing to potential players on their teams, and movie theater audiences.[29] By one measure, nearly 40% of automobile drivers aged 16 to 30 years old text while driving, and by another, 40% of teenagers said they could text blindfolded.[29]
[edit] Safety concerns
As of 2007, several airlines are experimenting with base station and antenna systems installed to the aeroplane, allowing low power, short-range connection of any phones aboard to remain connected to the aircraft's base station.[30] Thus, they would not attempt connection to the ground base stations as during take off and landing.[citation needed] Simultaneously, airlines may offer phone services to their travelling passengers either as full voice and data services, or initially only as SMS text messaging and similar services. Qantas, the Australian airline, is the first airline to run a test aeroplane in this configuration in the autumn of 2007.[citation needed] Emirates has announced plans to allow limited mobile phone usage on some flights.[citation needed] However, in the past, commercial airlines have prevented the use of cell phones and laptops, due to the assertion that the frequencies emitted from these devices may disturb the radio waves contact of the airplane.
On March 20, 2008, an Emirates flight was the first time voice calls have been allowed in-flight on commercial airline flights. The breakthrough came after the European Aviation Safety Agency (EASA) and the United Arab Emirates-based General Civil Aviation Authority (GCAA) granted full approval for the AeroMobile system to be used on Emirates. Passengers were able to make and receive voice calls as well as use text messaging. The system automatically came into operation as the Airbus A340-300 reached cruise altitude. Passengers wanting to use the service received a text message welcoming them to the AeroMobile system when they first switched their phones on. The approval by EASA has established that GSM phones are safe to use on airplanes, as the AeroMobile system does not require the modification of aircraft components deemed "sensitive," nor does it require the use of modified phones.
In any case, there are inconsistencies between practices allowed by different airlines and even on the same airline in different countries. For example, Northwest Airlines may allow the use of mobile phones immediately after landing on a domestic flight within the US, whereas they may state "not until the doors are open" on an international flight arriving in the Netherlands. In April 2007 the US Federal Communications Commission officially prohibited passengers' use of cell phones during a flight.[31]
In a similar vein, signs are put up in many countries, such as Canada, the U.K. and the U.S., at petrol stations prohibiting the use of mobile phones, due to possible safety issues.[citation needed]
[edit] Etiquette
Most schools in the United States and Europe have prohibited mobile phones in the classroom, or in school due to the large number of class disruptions that result from their use, and the potential for cheating via text messaging[citation needed]. In the UK, possession of a mobile phone in an examination can result in immediate disqualification from that subject or from all that student's subjects.[32]. Cell phones could be also used for bullying and threats to other students, or displaying inappropriate material in school.
A working group made up of Finnish telephone companies, public transport operators and communications authorities has launched a campaign to remind mobile phone users of courtesy, especially when using mass transit—what to talk about on the phone, and how to. In particular, the campaign wants to impact loud mobile phone usage as well as calls regarding sensitive matters.[33]
Many US cities with subway transit systems underground are studying or have implemented mobile phone reception in their underground tunnels for their riders. Boston, Massachusetts has investigated such usage in their tunnels, although there is a question of usage etiquette and also how to fairly award contracts to carriers.[34][35]
The issue of mobile communication and etiquette has also become an issue of academic interest. The rapid adoption of the device has resulted in the intrusion of telephony into situations where this was previously not known. This has exposed the implicit rules of courtesy and opened them to reevaluation.[36]
[edit] Use by drivers
This driver is using two phones at once
Main article: Mobile phones and driving safety
The use of mobile phones by people who are driving has become increasingly common, either as part of their job, as in the case of delivery drivers who are calling a client, or by commuters who are chatting with a friend. While many drivers have embraced the convenience of using their cellphone while driving, some jurisdictions have made the practice against the law, such as the Canadian provinces of Quebec, Nova Scotia, and Newfoundland and Labrador as well as the United Kingdom, consisting of a zero-tolerance system operated in Scotland and a warning system operated in England, Wales, and Northern Ireland. Officials from these jurisdictions argue that using a mobile phone while driving is an impediment to vehicle operation that can increase the risk of road traffic accidents.
Studies have found vastly different relative risks (RR). Two separate studies using case-crossover analysis each calculated RR at 4,[37][38] while an epidemiological cohort study found RR, when adjusted for crash-risk exposure, of 1.11 for men and 1.21 for women.[39]
A simulation study from the University of Utah Professor David Strayer compared drivers with a blood alcohol content of 0.08% to those conversing on a cell phone, and after controlling for driving difficulty and time on task, the study concluded that cell phone drivers exhibited greater impairment than intoxicated drivers. [40] Meta-analysis by The Canadian Automobile Association[41] and The University of Illinois[42] found that response time while using both hands-free and hand-held phones was approximately 0.5 standard deviations higher than normal driving (i.e., an average driver, while talking on a cell phone, has response times of a driver in roughly the 40th percentile).
Driving while using a hands-free device is not safer than driving while using a hand-held phone, as concluded by case-crossover studies.[37][38] epidemiological studies,[39] simulation studies,[40] and meta-analysis[41][42]. Even with this information, California recently passed a cell phone law that requires drivers who are 18 years of age or older to use a hands-free device while using the phone in the vehicle. Moreover, this law also restricts drivers under the age of 18 from using a mobile phone. This law goes into effect on July 1, 2008 with a $20 fine for the first offense and $50 fines for each subsequent conviction. The consistency of increased crash risk between hands-free and hand-held phone use is at odds with legislation in over 30 countries that prohibit hand-held phone use but allow hands-free. Scientific literature is mixed on the dangers of talking on a phone versus those of talking with a passenger, with the Accident Research Unit at the University of Nottingham finding that the number of utterances was usually higher for mobile calls when compared to blindfolded and non-blindfolded passengers,[43] but the University of Illinois meta-analysis concluding that passenger conversations were just as costly to driving performance as cell phone ones.[42]
[edit] Environmental impacts
Cellular antenna disguised to look like a tree
Like all high structures, cellular antenna masts pose a hazard to low flying aircraft. Towers over a certain height or towers that are close to airports or heliports are normally required to have warning lights. There have been reports that warning lights on cellular masts, TV-towers and other high structures can attract and confuse birds. US authorities estimate that millions of birds are killed near communication towers in the country each year.[44]
Some cellular antenna towers have been camouflaged to make them less obvious on the horizon, and make them look more like a tree.
An example of the way mobile phones and mobile networks have sometimes been perceived as a threat is the widely reported and later discredited claim that mobile phone masts are associated with the Colony Collapse Disorder (CCD) which has reduced bee hive numbers by up to 75% in many areas, especially near cities in the US. The Independent newspaper cited a scientific study claiming it provided evidence for the theory that mobile phone masts are a major cause in the collapse of bee populations, with controlled experiments demonstrating a rapid and catastrophic effect on individual hives near masts.[45] Mobile phones were in fact not covered in the study, and the original researchers have since emphatically disavowed any connection between their research, mobile phones, and CCD, specifically indicating that the Independent article had misinterpreted their results and created "a horror story".[46][47][48] While the initial claim of damage to bees was widely reported, the corrections to the story were almost non-existent in the media.
See also: Electronic waste
There are more than 500 million used mobile phones in the US sitting on shelves or in landfills [2], and it is estimated that over 125 million will be discarded this year alone. [3] The problem is growing at a rate of more than two million phones per week, putting tons of toxic waste into landfills daily. Several sites including PaceButler Corporation, TradeMyCell.com, ReCellular, and MyGreenElectronics offer to buy back and recycle mobile phones from users. In the United States many unwanted but working mobile phones are donated to women's shelters to allow emergency communication.
[edit] History
Main article: History of mobile phones
In 1908, U.S. Patent 887,357 for a wireless telephone was issued in to Nathan B. Stubblefield of Murray, Kentucky. He applied this patent to "cave radio" telephones and not directly to cellular telephony as the term is currently understood.[49] Cells for mobile phone base stations were invented in 1947 by Bell Labs engineers at AT&T and further developed by Bell Labs during the 1960s. Radiophones have a long and varied history going back to Reginald Fessenden's invention and shore-to-ship demonstration of radio telephony, through the Second World War with military use of radio telephony links and civil services in the 1950s, while hand-held cellular radio devices have been available since 1973. A patent for the first wireless phone as we know today was issued in US Patent Number 3,449,750 to George Sweigert of Euclid, Ohio on June 10th, 1969. Due to their low establishment costs and rapid deployment, mobile phone networks have since spread rapidly throughout the world, outstripping the growth of fixed telephony.[citation needed]
In 1945, the zero generation (0G) of mobile telephones was introduced. 0G mobile phones, such as Mobile Telephone Service, were not cellular, and so did not feature "handover" from one base station to the next and reuse of radio frequency channels.[citation needed] Like other technologies of the time, it involved a single, powerful base station covering a wide area, and each telephone would effectively monopolize a channel over that whole area while in use. The concepts of frequency reuse and handoff as well as a number of other concepts that formed the basis of modern cell phone technology are first described in U.S. Patent 4,152,647 , issued May 1, 1979 to Charles A. Gladden and Martin H. Parelman, both of Las Vegas, Nevada and assigned by them to the United States Government.
This is the first embodiment of all the concepts that formed the basis of the next major step in mobile telephony, the Analog cellular telephone. Concepts covered in this patent (cited in at least 34 other patents) also were later extended to several satellite communication systems. Later updating of the cellular system to a digital system credits this patent.
Martin Cooper, a Motorola researcher and executive is widely considered to be the inventor of the first practical mobile phone for handheld use in a non-vehicle setting. Using a modern, if somewhat heavy portable handset, Cooper made the first call on a handheld mobile phone on April 3, 1973.[50]
The first commercial citywide cellular network was launched in Japan by NTT in 1979. Fully automatic cellular networks were first introduced in the early to mid 1980s (the 1G generation). The Nordic Mobile Telephone (NMT) system went online in Denmark, Finland, Norway and Sweden in 1981.[51] NMT was the first mobile phone system that enabled international use of the phone, or "roaming" on other networks in other countries. This was followed by a boom in mobile phone usage, particularly in Northern Europe.[citation needed]
In 1983, Motorola DynaTAC was the first approved mobile phone by FCC in the United States. In 1984, Bell Labs developed modern commercial cellular technology (based, to a large extent, on the Gladden, Parelman Patent), which employed multiple, centrally-controlled base stations (cell sites), each providing service to a small area (a cell). The cell sites would be set up such that cells partially overlapped. In a cellular system, a signal between a base station (cell site) and a terminal (phone) only need be strong enough to reach between the two, so the same channel can be used simultaneously for separate conversations in different cells.
Cellular systems required several leaps of technology, including handover, which allowed a conversation to continue as a mobile phone traveled from cell to cell. This system included variable transmission power in both the base stations and the telephones (controlled by the base stations), which allowed range and cell size to vary. As the system expanded and neared capacity, the ability to reduce transmission power allowed new cells to be added, resulting in more, smaller cells and thus more capacity. The evidence of this growth can still be seen in the many older, tall cell site towers with no antennae on the upper parts of their towers. These sites originally created large cells, and so had their antennae mounted atop high towers; the towers were designed so that as the system expanded—and cell sizes shrank—the antennae could be lowered on their original masts to reduce range.
The first "modern" network technology on digital 2G (second generation) cellular technology was launched by Radiolinja (now part of Elisa Group) in 1991 in Finland on the GSM standard which also marked the introduction of competition in mobile telecoms when Radiolinja challenged incumbent Telecom Finland (now part of TeliaSonera) who ran a 1G NMT network.
The first data services appeared on mobile phones starting with person-to-person SMS text messaging in Finland in 1993. First trial payments using a mobile phone to pay for a Coca Cola vending machine were set in Finland in 1998. The first commercial payments were mobile parking trialled in Sweden but first commercially launched in Norway in 1999. The first commercial payment system to mimick banks and credit cards was launched in the Philippines in 1999 simultaneously by mobile operators Globe and Smart. The first content sold to mobile phones was the ringing tone, first launched in 1998 in Finland. The first full internet service on mobile phones was i-Mode introduced by NTT DoCoMo in Japan in 1999.
In 2001 the first commercial launch of 3G (Third Generation) was again in Japan by NTT DoCoMo on the WCDMA standard.[citation needed][52]
Until the early 1990s, most mobile phones were too large to be carried in a jacket pocket, so they were typically installed in vehicles as car phones. With the miniaturization of digital components and the development of more sophisticated batteries, mobile phones have become smaller and lighter.
In the 2000s, video and TV services are driving forward third generation (3G) deployment. In the future, low cost, high speed data may drive forward the fourth generation (4G) as short-range communication emerges. Service and application ubiquity, low cost data delivery, and a high degree of personalization and synchronization between various user appliances will be drivers. At the same time, the radio access network may evolve from a centralized architecture to a distributed one.[citation needed]
[edit] Terminology
[edit] Related non-mobile-phone systems
Car phone
A type of telephone permanently mounted in a vehicle, these often have more powerful transmitters, an external antenna and loudspeaker for handsfree use. They usually connect to the same networks as regular mobile phones.
Cordless telephone (portable phone)
Cordless phones are telephones which use one or more radio handsets in place of a wired handset. The handsets connect wirelessly to a base station, which in turn connects to a conventional land line for calling. Unlike mobile phones, cordless phones use private base stations (belonging to the land-line subscriber), and which are not shared.
Professional Mobile Radio
Advanced professional mobile radio systems can be very similar to mobile phone systems. Notably, the IDEN standard has been used as both a private trunked radio system as well as the technology for several large public providers. Similar attempts have even been made to use TETRA, the European digital PMR standard, to implement public mobile networks.
Radio phone
This is a term which covers radios which could connect into the telephone network. These phones may not be mobile; for example, they may require a mains power supply, they may require the assistance of a human operator to set up a PSTN phone call.
Satellite phone
This type of phone communicates directly with an artificial satellite, which in turn relays calls to a base station or another satellite phone. A single satellite can provide coverage to a much greater area than terrestrial base stations. Since satellite phones are costly, their use is typically limited to people in remote areas where no mobile phone coverage exists, such as mountain climbers and mariners in the open sea.
From Wikipedia, the free encyclopedia
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"Cell phone" redirects here. For the movie, see Cell Phone (film).
Several examples of non-flip mobile phones.
A mobile phone (also known as a wireless phone or cellular phone[1]) is a short-range, electronic device used for mobile voice or data communication over a network of specialised base stations known as cell sites. In addition to the standard voice function of a mobile phone, telephone, current mobile phones may support many additional services, and accessories, such as SMS for text messaging, email, packet switching for access to the Internet, gaming, bluetooth, infrared, camera with video recorder and MMS for sending and receiving photos and video. Most current mobile phones connect to a cellular network of base stations (cell sites), which is in turn interconnected to the public switched telephone network (PSTN) (the exception is satellite phones).Overview
According to internal memos, American Telephone & Telegraph discussed developing a wireless phone in 1915, but were afraid deployment of the technology could undermine its monopoly on wired service in the U.S.[2]
The first commercial mobile phone service was launched in Japan by NTT in 1978. By November 2007, the total number of mobile phone subscriptions in the world had reached 3.3 billion, or half of the human population (although some users have multiple subscriptions, or inactive subscriptions), which also makes the mobile phone the most widely spread technology and the most common electronic device in the world.[3]
The first mobile phone to enable internet connectivity and wireless email, the Nokia Communicator, was released in 1996, creating a new category of multi-use devices called smartphones. In 1999 the first mobile internet service was launched by NTT DoCoMo in Japan under the i-Mode service. By 2007 over 798 million people around the world accessed the internet or equivalent mobile internet services such as WAP and i-Mode at least occasionally using a mobile phone rather than a personal computer.
[edit] Cellular systems
See also: Cellular frequencies
Mobile phone tower
Mobile phones send and receive radio signals with any number of cell site base stations fitted with microwave antennas. These sites are usually mounted on a tower, pole or building, located throughout populated areas, then connected to a cabled communication network and switching system. The phones have a low-power transceiver that transmits voice and data to the nearest cell sites, normally not more than 8 to 13 km (approximately 5 to 8 miles) away.
When the mobile phone or data device is turned on, it registers with the mobile telephone exchange, or switch, with its unique identifiers, and can then be alerted by the mobile switch when there is an incoming telephone call. The handset constantly listens for the strongest signal being received from the surrounding base stations, and is able to switch seamlessly between sites. As the user moves around the network, the "handoffs" are performed to allow the device to switch sites without interrupting the call.
Cell sites have relatively low-power (often only one or two watts) radio transmitters which broadcast their presence and relay communications between the mobile handsets and the switch. The switch in turn connects the call to another subscriber of the same wireless service provider or to the public telephone network, which includes the networks of other wireless carriers. Many of these sites are camouflaged to blend with existing environments, particularly in scenic areas.
The dialogue between the handset and the cell site is a stream of digital data that includes digitised audio (except for the first generation analog networks). The technology that achieves this depends on the system which the mobile phone operator has adopted. The technologies are grouped by generation. The first-generation systems started in 1979 with Japan, are all analog and include AMPS and NMT. Second-generation systems, started in 1991 in Finland, are all digital and include GSM, CDMA and TDMA.
The nature of cellular technology renders many phones vulnerable to 'cloning': anytime a cell phone moves out of coverage (for example, in a road tunnel), when the signal is re-established, the phone sends out a 're-connect' signal to the nearest cell-tower, identifying itself and signalling that it is again ready to transmit. With the proper equipment, it's possible to intercept the re-connect signal and encode the data it contains into a 'blank' phone -- in all respects, the 'blank' is then an exact duplicate of the real phone and any calls made on the 'clone' will be charged to the original account.
Third-generation (3G) networks, which are still being deployed, began in Japan in 2001. They are all digital, and offer high-speed data access in addition to voice services and include W-CDMA (known also as UMTS), and CDMA2000 EV-DO. China will launch a third generation technology on the TD-SCDMA standard. Operators use a mix of predesignated frequency bands determined by the network requirements and local regulations.
In an effort to limit the potential harm from having a transmitter close to the user's body, the first fixed/mobile cellular phones that had a separate transmitter, vehicle-mounted antenna, and handset (known as car phones and bag phones) were limited to a maximum 3 watts Effective Radiated Power. Modern handheld cellphones which must have the transmission antenna held inches from the user's skull are limited to a maximum transmission power of 0.6 watts ERP. Regardless of the potential biological effects, the reduced transmission range of modern handheld phones limits their usefulness in rural locations as compared to car/bag phones, and handhelds require that cell towers be spaced much closer together to compensate for their lack of transmission power.
Some handhelds include an optional auxiliary antenna port on the back of the phone, which allows it to be connected to a large external antenna and a 3 watt cellular booster. Alternately in fringe-reception areas, a cellular repeater may be used, which uses a long distance high-gain dish antenna or yagi antenna to communicate with a cell tower far outside of normal range, and a repeater to rebroadcast on a small short-range local antenna that allows any cellphone within a few meters to function properly.
[edit] Handsets
Nokia is currently the world's largest manufacturer of mobile phones, with a global device market share of approximately 40% in 2008. Other major mobile phone manufacturers (in order of market share) include Samsung (14%), Motorola (14%), Sony Ericsson (9%) and LG (7%).[4] These manufacturers account for over 80% of all mobile phones sold and produce phones for sale in most countries.
Other manufacturers include Apple Inc., Audiovox (now UTStarcom), Benefon, BenQ-Siemens, CECT, High Tech Computer Corporation (HTC), Fujitsu, Kyocera, Mitsubishi Electric, NEC, Neonode, Panasonic (Matsushita Electric), Pantech Curitel, Philips, Research In Motion, Sagem, Sanyo, Sharp, Siemens, Sendo, Sierra Wireless, SK Teletech, Sonim Technologies, T&A Alcatel, Huawei, Trium and Toshiba. There are also specialist communication systems related to (but distinct from) mobile phones.
There are several categories of mobile phones, from basic phones to feature phones such as musicphones and cameraphones, to smartphones. The first smartphone was the Nokia 9000 Communicator in 1996 which incorporated PDA functionality to the basic mobile phone at the time. As miniaturisation and increased processing power of microchips has enabled ever more features to be added to phones, the concept of the smartphone has evolved, and what was a high-end smartphone five years ago, is a standard phone today. Several phone series have been introduced to address a given market segment, such as the RIM Blackberry focusing on enterprise/corporate customer email needs; the SonyEricsson Walkman series of musicphones and Cybershot series of cameraphones; the Nokia N-Series of multimedia phones; and the Apple iPhone which provides full-featured web access and multimedia capabilities.
Main article: Mobile phone features
Mobile phones often have features beyond sending text messages and making voice calls, including Internet browsing, music (MP3) playback, memo recording, personal organiser functions, e-mail, instant messaging, built-in cameras and camcorders, ringtones, games, radio, Push-to-Talk (PTT), infrared and Bluetooth connectivity, call registers, ability to watch streaming video or download video for later viewing, video calling and serve as a wireless modem for a PC, and soon will also serve as a console of sorts to online games and other high quality games. The total value of mobile data services exceeds the value of paid services on the Internet, and was worth 31 billion dollars in 2006 (source Informa).[citation needed] The largest categories of mobile services are music, picture downloads, videogaming, adult entertainment, gambling, video/TV.
[edit] Applications
The most commonly used data application on mobile phones is SMS text messaging, with 74% of all mobile phone users as active users (over 2.4 billion out of 3.3 billion total subscribers at the end of 2007). SMS text messaging was worth over 100 billion dollars in annual revenues in 2007 and the worldwide average of messaging use is 2.6 SMS sent per day per person across the whole mobile phone subscriber base. (source Informa 2007). The first SMS text message was sent from a computer to a mobile phone in 1992 in the UK, while the first person-to-person SMS from phone to phone was sent in Finland in 1993.
The other non-SMS data services used by mobile phones were worth 31 Billion dollars in 2007, and were led by mobile music, downloadable logos and pictures, gaming, gambling, adult entertainment and advertising (source: Informa 2007). The first downloadable mobile content was sold to a mobile phone in Finland in 1998, when Radiolinja (now Elisa) introduced the downloadable ringing tone service. In 1999 Japanese mobile operator NTT DoCoMo introduced its mobile internet service, i-Mode, which today is the world's largest mobile internet service and roughly the same size as Google in annual revenues.
The first mobile news service, delivered via SMS, was launched in Finland in 2000. Mobile news services are expanding with many organisations providing "on-demand" news services by SMS. Some also provide "instant" news pushed out by SMS. Mobile telephony also facilitates activism and public journalism being explored by Reuters and Yahoo![5] and small independent news companies such as Jasmine News in Sri Lanka.
Companies like Monster are starting to offer mobile services such as job search and career advice. Consumer applications are on the rise and include everything from information guides on local activities and events to mobile coupons and discount offers one can use to save money on purchases. Even tools for creating websites for mobile phones are increasingly becoming available, e.g. Mobilemo.
Mobile payments were first trialled in Finland in 1998 when two coca cola machines in Espoo were enabled to work with SMS payments. Eventually the idea spread and in 1999 the Philippines launched the first commercial mobile payments systems, on the mobile operators Globe and Smart. Today mobile payments ranging from mobile banking to mobile credit cards to mobile commerce are very widely used in Asia and Africa, and in selected European markets. For example in the Philippines it is not unusual to have your whole paycheck paid to the mobile account. In Kenya the limit of money transfers from one mobile banking account to another is one million US dollars. In India paying utility bills with mobile gains a 5% discount. In Estonia the government found criminals collecting cash parking fees, so the government declared that only mobile payments via SMS were valid for parking and today all parking fees in Estonia are handled via mobile and the crime involved in the activity has vanished.
Mobile Applications are developed using the Six M's (previously Five M's) service-development theory created by the author Tomi Ahonen with Joe Barrett of Nokia and Paul Golding of Motorola. The Six M's are Movement (location), Moment (time), Me (personalisation), Multi-user (community), Money (payments) and Machines (automation). The Six M's / Five M's theory is widely referenced in the telecoms applications literature and used by most major industry players. The first book to discuss the theory was Services for UMTS by Ahonen & Barrett in 2002.
The availability of mobile phone backup applications is growing with the increasing amount of mobile phone data being stored on mobile phones today. With mobile phone manufacturers producing mobile handsets with more and more memory storage capabilities the awareness of the importance in backing up mobile phone data is increasing. Corporate mobile phone users today keep very important company information on their mobiles, information if lost then not easily replaced. Wireless backup applications like SC BackUp offer users the chance to backup mobile phone data using advanced wireless technology. Users can backup, restore or transfer mobile data anytime, anywhere all over the world, to a secured server.
Other common applications include diaries, timers, chronometers, games, ...
[edit] Media
The mobile phone became a mass media channel in 1998 when the first ringing tones were sold to mobile phones by Radiolinja in Finland. Soon other media content appeared such as news, videogames, jokes, horoscopes, TV content and advertising. In 2006 the total value of mobile phone paid media content exceeded internet paid media content and was worth 31 Billion dollars (source Informa 2007). The value of music on phones was worth 9.3 Billion dollars in 2007 and gaming was worth over 5 billion dollars in 2007 (source Netsize Guide 2008 [1]).
The mobile phone is often called the Fourth Screen (if counting cinema, TV and PC screens as the first three) or Third Screen (counting only TV and PC screens). It is also called the Seventh of the Mass Media (with Print, Recordings, Cinema, Radio, TV and Internet the first six). Most early content for mobile tended to be copies of legacy media, such as the banner advertisement or the TV news highlight video clip. Recently unique content for mobile has been emerging, from the ringing tones and ringback tones in music to "mobisodes," video content that has been produced exclusively for mobile phones.
The advent of media on the mobile phone has also produced the opportunity to identify and track Alpha Users or Hubs, the most influential members of any social community. AMF Ventures measured in 2007 the relative accuracy of three mass media, and found that audience measures on mobile were nine times more accurate than on the internet and 90 times more accurate than on TV.
[edit] Power supply
Mobile phones generally obtain power from batteries, which can be recharged from a USB port, from portable batteries, from mains power or a cigarette lighter socket in a car using an adapter (often called battery charger or wall wart) or from a solar panel or a dynamo (that can also use a USB port to plug the phone).
Formerly, the most common form of mobile phone batteries were nickel metal-hydride, as they have a low size and weight. Lithium-Ion batteries are sometimes used, as they are lighter and do not have the voltage depression that nickel metal-hydride batteries do. Many mobile phone manufacturers have now switched to using lithium-Polymer batteries as opposed to the older Lithium-Ion, the main advantages of this being even lower weight and the possibility to make the battery a shape other than strict cuboid. Mobile phone manufacturers have been experimenting with alternative power sources, including solar cells.
[edit] SIM card
In addition to the battery, most cellphones require a small microchip, called a Subscriber Identity Module or SIM Card, to function. Approximately the size of a small postage stamp, the SIM Card is usually placed underneath the battery in the rear of the unit, and (when properly activated) stores the phone's configuration data, and information about the phone itself, such as which calling plan the subscriber is using. When the subscriber removes the SIM Card, it can be re-inserted into another phone and used as normal.
Each SIM Card is activated by use of a unique numerical identifier; once activated, the identifier is locked down and the card is permanently locked in to the activating network. For this reason, most retailers refuse to accept the return of an activated SIM Card.
Those cell phones that do not use a SIM Card have the data programmed in to their memory. This data is accessed by using a special digit sequence to access the "NAM" as in "Name" or number programming menu. From here, one can add information such as a new number for your phone, new Service Provider numbers, new emergency numbers, change their Authentication Key or A-Key code, and update their Preferred Roaming List or PRL. However, to prevent the average Joe from totally disabling their phone or removing it from the network, the Service Provider puts a lock on this data called a Master Subsidiary Lock or MSL.
The MSL also ensures that the Service Provider gets payment for the phone that was purchased or "leased". For example, the Motorola Razr V9C costs upwards of CAD $500. You can get one from Bell Mobility for approximately $200. The difference is paid by the customer in the form of a monthly bill. If, in this case, Bell Mobility did not use a MSL, then they may lose the $300–$400 difference that is paid in the monthly bill, since some customers would cancel their service and take the phone to another carrier such as Telus, or Verizon. This would eventually put the carrier or in this case, Bell Mobility out of business.
[edit] Usage
[edit] By civilians
This Railfone found on some Amtrak trains in North America uses cellular technology.
See also: List of mobile network operators
An increasing number of countries, particularly in Europe, now have more mobile phones than people. According to the figures from Eurostat, the European Union's in-house statistical office, Luxembourg had the highest mobile phone penetration rate at 158 mobile subscriptions per 100 people (158%), closely followed by Lithuania and Italy.[6] In Hong Kong the penetration rate reached 139.8% of the population in July 2007.[7] Over 50 countries have mobile phone subscription penetration rates higher than that of the population and the Western European average penetration rate was 110% in 2007 (source Informa 2007). The U.S. currently has one of the lowest rates of mobile phone penetrations in the industrialised world at 85%.
There are over five hundred million active mobile phone accounts in China, as of 2007, but the total penetration rate there still stands below 50%.[8] The total number of mobile phone subscribers in the world was estimated at 2.14 billion in 2005.[9] The subscriber count reached 2.7 billion by end of 2006 according to Informa[citation needed], and 3.3 billion by November, 2007[3], thus reaching an equivalent of over half the planet's population. Around 80% of the world's population has access to mobile phone coverage, as of 2006. This figure is expected to increase to 90% by the year 2010.[10]
In some developing countries with little "landline" telephone infrastructure, mobile phone use has quadrupled in the last decade.[11] The rise of mobile phone technology in developing countries is often cited as an example of the leapfrog effect. Many remote regions in the third world went from having no telecommunications infrastructure to having satellite based communications systems. At present, Africa has the largest growth rate of cellular subscribers in the world,[12] its markets expanding nearly twice as fast as Asian markets.[13] The availability of prepaid or 'pay-as-you-go' services, where the subscriber is not committed to a long term contract, has helped fuel this growth in Africa as well as in other continents.
On a numerical basis, India is the largest growth market, adding about 6 million mobile phones every month.[14] With 256.55 million total landline and mobile phones, market penetration in the country is still low at 22.52%. India expects to reach 500 million subscribers by end of 2010. Simultaneously, landline phone ownership is decreasing gradually and accounts for approximately 40 million connections.
There are three major technical standards for the current generation of mobile phones and networks, and two major standards for the next generation 3G phones and networks. All European and African countries and many Asian countries have adopted a single system, GSM, which is the only technology available on all continents and in most countries and covers over 74% of all subscribers on mobile networks. In many countries, such as the United States, Australia, Brazil, Canada, Costa Rica, India, and South Korea and Vietnam GSM co-exists with other internationally adopted standards such as CDMA and TDMA, as well as national standards such as iDEN in the USA and PDC in Japan. Over the past five years several dozen mobile operators (carriers) have abandoned networks on TDMA and CDMA technologies, switching over to GSM.
With third generation (3G) networks, which are also known as IMT-2000 networks, about three out of four networks are on the W-CDMA (also known as UMTS) standard, usually seen as the natural evolution path for GSM and TDMA networks. One in four 3G networks is on the CDMA2000 1x EV-DO technology. Some analysts count a previous stage in CDMA evolution, CDMA2000 1x RTT, as a 3G technology whereas most standardization experts count only CDMA2000 1x EV-DO as a true 3G technology. Because of this difference in interpreting what is 3G, there is a wide variety in subscriber counts. As of June 2007, on the narrow definition there are 200 million subscribers on 3G networks. By using the more broad definition, the total subscriber count of 3G phone users is 475 million.
[edit] Culture and customs
Between the 1980s and the 2000s, the mobile phone has gone from being an expensive item used by the business elite to a pervasive, personal communications tool for the general population. In most countries, mobile phones outnumber land-line phones, with fixed landlines numbering 1.3 Billion but mobile subscriptions 3.3 Billion at the end of 2007.
In many markets from Japan and South Korea, to Scandinavia, to Malaysia, Singapore, Taiwan and Hong Kong, most children age 8-9 have mobile phones and the new accounts are now opened for customers aged 6 and 7. Where mostly parents tend to give hand-me-down used phones to their youngest children, in Japan already new cameraphones are on the market whose target age group is under 10 years of age, introduced by KDDI in February 2007. The USA also lags on this measure, as in the US so far, about half of all children have mobile phones.[15] In many young adults' households it has supplanted the land-line phone. Mobile phone usage is banned in some countries, such as North Korea and restricted in some other countries such as Burma.[16]
Given the high levels of societal mobile phone service penetration, it is a key means for people to communicate with each other. The SMS feature spawned the "texting" sub-culture amongst younger users. In December 1993, the first person-to-person SMS text message was transmitted in Finland. Currently, texting is the most widely-used data service; 1.8 billion users generated $80 billion of revenue in 2006 (source ITU). Many phones offer Instant Messenger services for simple, easy texting. Mobile phones have Internet service (e.g. NTT DoCoMo's i-mode), offering text messaging via e-mail in Japan, South Korea, China, and India. Most mobile internet access is much different from computer access, featuring alerts, weather data, e-mail, search engines, instant messages, and game and music downloading; most mobile internet access is hurried and short.
The mobile phone can be a fashion totem custom-decorated to reflect the owner's personality.[17] This aspect of the mobile telephony business is, in itself, an industry, e.g. ringtone sales amounted to $3.5 billion in 2005.[18]
The use of a mobile phone is prohibited in some train company carriages
Mobile phone use can be an important matter of social discourtesy: phones ringing during funerals or weddings; in toilets, cinemas and theatres. Some book shops, libraries, bathrooms, cinemas, doctors' offices and places of worship prohibit their use, so that other patrons will not be disturbed by conversations. Some facilities install signal-jamming equipment to prevent their use, although in many countries, including the US, such equipment is illegal. Some new auditoriums have installed wire mesh in the walls to make a Faraday cage, which prevents signal penetration without violating signal jamming laws.[citation needed]
Trains, particularly those involving long-distance services, often offer a "quiet carriage" where phone use is prohibited, much like the designated non-smoking carriage of the past. In the UK however many users tend to ignore this as it is rarely enforced, especially if the other carriages are crowded and they have no choice but to go in the "quiet carriage".[citation needed] In Japan, it is generally considered impolite to talk using a phone on any train -- texting is generally the mode of mobile communication. Mobile phone usage on local public transport is also increasingly seen as a nuisance; the city of Graz, for instance, has mandated a total ban of mobile phones on its tram and bus network in 2008 (though texting is still allowed).[19][20]
Mobile phone use on aircraft is also prohibited and many airlines claim in their in-plane announcements that this prohibition is due to possible interference with aircraft radio communications. Shut-off mobile phones do not interfere with aircraft avionics; the concern is partially based on the crash of Crossair Flight 498.
[edit] By government agencies
[edit] Law enforcement
Main article: Lawful interception
Law enforcement have used mobile phone evidence in a number of different ways. In the EU the "communications of every mobile telephone user are recorded".[21] In other countries, evidence about the physical location of an individual at a given time has been introduced by triangulating the individual's cellphone between several cellphone towers. This triangulation technique can be used to show that an individual's cellphone was at a certain location at a certain time. The concerns over terrorism and terrorist use of technology prompted an inquiry by the British House of Commons Home Affairs Select Committee into the use of evidence from mobile phone devices, prompting leading mobile telephone forensic specialists to identify forensic techniques available in this area.[22] NIST have published guidelines and procedures for the preservation, acquisition, examination, analysis, and reporting of digital information present on mobile phones can be found under the NIST Publication SP800-101.[23]
In the UK in 2000 it was claimed that recordings of mobile phone conversations made on the day of the Omagh bombing were crucial to the police investigation. In particular, calls made on two mobile phones which were tracked from south of the Irish border to Omagh and back on the day of the bombing, were considered of vital importance.[24]
Further example of criminal investigations using mobile phones is the initial location and ultimate identification of the terrorists of the 2004 Madrid train bombings. In the attacks, mobile phones had been used to detonate the bombs. However, one of the bombs failed to detonate, and the SIM card in the corresponding mobile phone gave the first serious lead about the terrorists to investigators. By tracking the whereabouts of the SIM card and correlating other mobile phones that had been registered in those areas, police were able to locate the terrorists.[25]
[edit] Disaster response
The Finnish government decided in 2005 that the fastest way to warn citizens of disasters was the mobile phone network. In Japan, mobile phone companies provide immediate notification of earthquakes and other natural disasters to their customers free of charge [26]. In the event of an emergency, disaster response crews can locate trapped or injured people using the signals from their mobile phones. An interactive menu accessible through the phone's Internet browser notifies the company if the user is safe or in distress.[citation needed] In Finland rescue services suggest hikers carry mobile phones in case of emergency even when deep in the forests beyond cellular coverage, as the radio signal of a cellphone attempting to connect to a base station can be detected by overflying rescue aircraft with special detection gear. Also, users in the United States can sign up through their provider for free text messages when an AMBER Alert goes out for a missing person in their area.
However, most mobile phone networks operate close to capacity during normal times and spikes in call volumes caused by widespread emergencies often overload the system just when it is needed the most. Examples reported in the media where this have occurred include the September 11, 2001 attacks, the Hawaiian earthquake, the 2003 Northeast blackouts, the 2005 London Tube bombings, Hurricane Katrina, and the 2007 Minnesota bridge collapse. Thus mobile phones are better for isolated emergencies such as vehicle accidents.
Under FCC regulations, all mobile telephones must be capable of dialing emergency services, regardless of the presence of a SIM card or the payment status of the account.
[edit] Business models
[edit] Tariff models
See also: GSM services#Voice charges
When cellular telecoms services were launched, phones and calls were very expensive and early mobile operators (carriers) decided to charge for all air time consumed by the mobile phone user. This resulted in the concept of charging callers for outbound calls and also for receiving calls. As mobile phone call charges diminished and phone adoption rates skyrocketed, more modern operators decided not to charge for incoming calls. Thus some markets have "Receiving Party Pays" models (also known as "Mobile Party Pays"), in which both outbound and received calls are charged, and other markets have "Calling Party Pays" models, by which only making calls produces costs, and receiving calls is free. An exception to this is international roaming tariffs, by which receiving calls are normally also charged.[citation needed]
The European market adopted a "Calling Party Pays" model throughout the GSM environment and soon various other GSM markets also started to emulate this model. As Receiving Party Pays systems have the undesired effect of phone owners keeping their phones turned off to avoid receiving unwanted calls, the total voice usage rates (and profits) in Calling Party Pays countries outperform those in Receiving Party Pays countries. Consequently, most countries previously with Receiving Party Pays models have either abandoned them or employed alternative marketing methods, such as massive voice call buckets, to avoid the problem of phone users keeping phones turned off.[citation needed]
In most countries today, the person receiving a mobile phone call pays nothing. However, in Hong Kong, Canada, and the United States, one can be charged per minute, for incoming as well as outgoing calls. In the United States and Canada, a few carriers are beginning to offer unlimited received phone calls. For the Chinese mainland, it was reported that both of its two operators will adopt the caller-pays approach as early as January 2007.[27]
While some systems of payment are 'pay-as-you-go' where conversation time is purchased and added to a phone unit via an Internet account or in shops or ATMs, other systems are more traditional ones where bills are paid by regular intervals. Pay as you go (also known as "pre-pay") accounts were invented simultaneously in Portugal and Italy and today form more than half of all mobile phone subscriptions. USA, Canada, Costa Rica, Japan and Finland are among the rare countries left where most phones are still contract-based.
One possible alternative is a sim-lock free mobile phone. Sim-lock free mobile phones allow portability between networks so users can use sim cards from various networks and not need to have their phone unlocked.
[edit] Impacts
[edit] Human health and behaviour
Main article: Mobile phone radiation and health
Since the introduction of mobile phones, concerns (both scientific and public) have been raised about the potential health impacts from regular use.[28] But by 2008, American mobile phones transmitted and received more text messages than phone calls.[29] Numerous studies have reported no significant relationship between mobile phone use and health, but the effect of mobile phone usage on health continues to be an area of public concern.
For example, at the request of some of their customers, Verizon created usage controls that meter service and can switch phones off, so that children could get some sleep.[29] Other users that some people are working on limiting include persons operating moving trains or automobiles, coaches when writing to potential players on their teams, and movie theater audiences.[29] By one measure, nearly 40% of automobile drivers aged 16 to 30 years old text while driving, and by another, 40% of teenagers said they could text blindfolded.[29]
[edit] Safety concerns
As of 2007, several airlines are experimenting with base station and antenna systems installed to the aeroplane, allowing low power, short-range connection of any phones aboard to remain connected to the aircraft's base station.[30] Thus, they would not attempt connection to the ground base stations as during take off and landing.[citation needed] Simultaneously, airlines may offer phone services to their travelling passengers either as full voice and data services, or initially only as SMS text messaging and similar services. Qantas, the Australian airline, is the first airline to run a test aeroplane in this configuration in the autumn of 2007.[citation needed] Emirates has announced plans to allow limited mobile phone usage on some flights.[citation needed] However, in the past, commercial airlines have prevented the use of cell phones and laptops, due to the assertion that the frequencies emitted from these devices may disturb the radio waves contact of the airplane.
On March 20, 2008, an Emirates flight was the first time voice calls have been allowed in-flight on commercial airline flights. The breakthrough came after the European Aviation Safety Agency (EASA) and the United Arab Emirates-based General Civil Aviation Authority (GCAA) granted full approval for the AeroMobile system to be used on Emirates. Passengers were able to make and receive voice calls as well as use text messaging. The system automatically came into operation as the Airbus A340-300 reached cruise altitude. Passengers wanting to use the service received a text message welcoming them to the AeroMobile system when they first switched their phones on. The approval by EASA has established that GSM phones are safe to use on airplanes, as the AeroMobile system does not require the modification of aircraft components deemed "sensitive," nor does it require the use of modified phones.
In any case, there are inconsistencies between practices allowed by different airlines and even on the same airline in different countries. For example, Northwest Airlines may allow the use of mobile phones immediately after landing on a domestic flight within the US, whereas they may state "not until the doors are open" on an international flight arriving in the Netherlands. In April 2007 the US Federal Communications Commission officially prohibited passengers' use of cell phones during a flight.[31]
In a similar vein, signs are put up in many countries, such as Canada, the U.K. and the U.S., at petrol stations prohibiting the use of mobile phones, due to possible safety issues.[citation needed]
[edit] Etiquette
Most schools in the United States and Europe have prohibited mobile phones in the classroom, or in school due to the large number of class disruptions that result from their use, and the potential for cheating via text messaging[citation needed]. In the UK, possession of a mobile phone in an examination can result in immediate disqualification from that subject or from all that student's subjects.[32]. Cell phones could be also used for bullying and threats to other students, or displaying inappropriate material in school.
A working group made up of Finnish telephone companies, public transport operators and communications authorities has launched a campaign to remind mobile phone users of courtesy, especially when using mass transit—what to talk about on the phone, and how to. In particular, the campaign wants to impact loud mobile phone usage as well as calls regarding sensitive matters.[33]
Many US cities with subway transit systems underground are studying or have implemented mobile phone reception in their underground tunnels for their riders. Boston, Massachusetts has investigated such usage in their tunnels, although there is a question of usage etiquette and also how to fairly award contracts to carriers.[34][35]
The issue of mobile communication and etiquette has also become an issue of academic interest. The rapid adoption of the device has resulted in the intrusion of telephony into situations where this was previously not known. This has exposed the implicit rules of courtesy and opened them to reevaluation.[36]
[edit] Use by drivers
This driver is using two phones at once
Main article: Mobile phones and driving safety
The use of mobile phones by people who are driving has become increasingly common, either as part of their job, as in the case of delivery drivers who are calling a client, or by commuters who are chatting with a friend. While many drivers have embraced the convenience of using their cellphone while driving, some jurisdictions have made the practice against the law, such as the Canadian provinces of Quebec, Nova Scotia, and Newfoundland and Labrador as well as the United Kingdom, consisting of a zero-tolerance system operated in Scotland and a warning system operated in England, Wales, and Northern Ireland. Officials from these jurisdictions argue that using a mobile phone while driving is an impediment to vehicle operation that can increase the risk of road traffic accidents.
Studies have found vastly different relative risks (RR). Two separate studies using case-crossover analysis each calculated RR at 4,[37][38] while an epidemiological cohort study found RR, when adjusted for crash-risk exposure, of 1.11 for men and 1.21 for women.[39]
A simulation study from the University of Utah Professor David Strayer compared drivers with a blood alcohol content of 0.08% to those conversing on a cell phone, and after controlling for driving difficulty and time on task, the study concluded that cell phone drivers exhibited greater impairment than intoxicated drivers. [40] Meta-analysis by The Canadian Automobile Association[41] and The University of Illinois[42] found that response time while using both hands-free and hand-held phones was approximately 0.5 standard deviations higher than normal driving (i.e., an average driver, while talking on a cell phone, has response times of a driver in roughly the 40th percentile).
Driving while using a hands-free device is not safer than driving while using a hand-held phone, as concluded by case-crossover studies.[37][38] epidemiological studies,[39] simulation studies,[40] and meta-analysis[41][42]. Even with this information, California recently passed a cell phone law that requires drivers who are 18 years of age or older to use a hands-free device while using the phone in the vehicle. Moreover, this law also restricts drivers under the age of 18 from using a mobile phone. This law goes into effect on July 1, 2008 with a $20 fine for the first offense and $50 fines for each subsequent conviction. The consistency of increased crash risk between hands-free and hand-held phone use is at odds with legislation in over 30 countries that prohibit hand-held phone use but allow hands-free. Scientific literature is mixed on the dangers of talking on a phone versus those of talking with a passenger, with the Accident Research Unit at the University of Nottingham finding that the number of utterances was usually higher for mobile calls when compared to blindfolded and non-blindfolded passengers,[43] but the University of Illinois meta-analysis concluding that passenger conversations were just as costly to driving performance as cell phone ones.[42]
[edit] Environmental impacts
Cellular antenna disguised to look like a tree
Like all high structures, cellular antenna masts pose a hazard to low flying aircraft. Towers over a certain height or towers that are close to airports or heliports are normally required to have warning lights. There have been reports that warning lights on cellular masts, TV-towers and other high structures can attract and confuse birds. US authorities estimate that millions of birds are killed near communication towers in the country each year.[44]
Some cellular antenna towers have been camouflaged to make them less obvious on the horizon, and make them look more like a tree.
An example of the way mobile phones and mobile networks have sometimes been perceived as a threat is the widely reported and later discredited claim that mobile phone masts are associated with the Colony Collapse Disorder (CCD) which has reduced bee hive numbers by up to 75% in many areas, especially near cities in the US. The Independent newspaper cited a scientific study claiming it provided evidence for the theory that mobile phone masts are a major cause in the collapse of bee populations, with controlled experiments demonstrating a rapid and catastrophic effect on individual hives near masts.[45] Mobile phones were in fact not covered in the study, and the original researchers have since emphatically disavowed any connection between their research, mobile phones, and CCD, specifically indicating that the Independent article had misinterpreted their results and created "a horror story".[46][47][48] While the initial claim of damage to bees was widely reported, the corrections to the story were almost non-existent in the media.
See also: Electronic waste
There are more than 500 million used mobile phones in the US sitting on shelves or in landfills [2], and it is estimated that over 125 million will be discarded this year alone. [3] The problem is growing at a rate of more than two million phones per week, putting tons of toxic waste into landfills daily. Several sites including PaceButler Corporation, TradeMyCell.com, ReCellular, and MyGreenElectronics offer to buy back and recycle mobile phones from users. In the United States many unwanted but working mobile phones are donated to women's shelters to allow emergency communication.
[edit] History
Main article: History of mobile phones
In 1908, U.S. Patent 887,357 for a wireless telephone was issued in to Nathan B. Stubblefield of Murray, Kentucky. He applied this patent to "cave radio" telephones and not directly to cellular telephony as the term is currently understood.[49] Cells for mobile phone base stations were invented in 1947 by Bell Labs engineers at AT&T and further developed by Bell Labs during the 1960s. Radiophones have a long and varied history going back to Reginald Fessenden's invention and shore-to-ship demonstration of radio telephony, through the Second World War with military use of radio telephony links and civil services in the 1950s, while hand-held cellular radio devices have been available since 1973. A patent for the first wireless phone as we know today was issued in US Patent Number 3,449,750 to George Sweigert of Euclid, Ohio on June 10th, 1969. Due to their low establishment costs and rapid deployment, mobile phone networks have since spread rapidly throughout the world, outstripping the growth of fixed telephony.[citation needed]
In 1945, the zero generation (0G) of mobile telephones was introduced. 0G mobile phones, such as Mobile Telephone Service, were not cellular, and so did not feature "handover" from one base station to the next and reuse of radio frequency channels.[citation needed] Like other technologies of the time, it involved a single, powerful base station covering a wide area, and each telephone would effectively monopolize a channel over that whole area while in use. The concepts of frequency reuse and handoff as well as a number of other concepts that formed the basis of modern cell phone technology are first described in U.S. Patent 4,152,647 , issued May 1, 1979 to Charles A. Gladden and Martin H. Parelman, both of Las Vegas, Nevada and assigned by them to the United States Government.
This is the first embodiment of all the concepts that formed the basis of the next major step in mobile telephony, the Analog cellular telephone. Concepts covered in this patent (cited in at least 34 other patents) also were later extended to several satellite communication systems. Later updating of the cellular system to a digital system credits this patent.
Martin Cooper, a Motorola researcher and executive is widely considered to be the inventor of the first practical mobile phone for handheld use in a non-vehicle setting. Using a modern, if somewhat heavy portable handset, Cooper made the first call on a handheld mobile phone on April 3, 1973.[50]
The first commercial citywide cellular network was launched in Japan by NTT in 1979. Fully automatic cellular networks were first introduced in the early to mid 1980s (the 1G generation). The Nordic Mobile Telephone (NMT) system went online in Denmark, Finland, Norway and Sweden in 1981.[51] NMT was the first mobile phone system that enabled international use of the phone, or "roaming" on other networks in other countries. This was followed by a boom in mobile phone usage, particularly in Northern Europe.[citation needed]
In 1983, Motorola DynaTAC was the first approved mobile phone by FCC in the United States. In 1984, Bell Labs developed modern commercial cellular technology (based, to a large extent, on the Gladden, Parelman Patent), which employed multiple, centrally-controlled base stations (cell sites), each providing service to a small area (a cell). The cell sites would be set up such that cells partially overlapped. In a cellular system, a signal between a base station (cell site) and a terminal (phone) only need be strong enough to reach between the two, so the same channel can be used simultaneously for separate conversations in different cells.
Cellular systems required several leaps of technology, including handover, which allowed a conversation to continue as a mobile phone traveled from cell to cell. This system included variable transmission power in both the base stations and the telephones (controlled by the base stations), which allowed range and cell size to vary. As the system expanded and neared capacity, the ability to reduce transmission power allowed new cells to be added, resulting in more, smaller cells and thus more capacity. The evidence of this growth can still be seen in the many older, tall cell site towers with no antennae on the upper parts of their towers. These sites originally created large cells, and so had their antennae mounted atop high towers; the towers were designed so that as the system expanded—and cell sizes shrank—the antennae could be lowered on their original masts to reduce range.
The first "modern" network technology on digital 2G (second generation) cellular technology was launched by Radiolinja (now part of Elisa Group) in 1991 in Finland on the GSM standard which also marked the introduction of competition in mobile telecoms when Radiolinja challenged incumbent Telecom Finland (now part of TeliaSonera) who ran a 1G NMT network.
The first data services appeared on mobile phones starting with person-to-person SMS text messaging in Finland in 1993. First trial payments using a mobile phone to pay for a Coca Cola vending machine were set in Finland in 1998. The first commercial payments were mobile parking trialled in Sweden but first commercially launched in Norway in 1999. The first commercial payment system to mimick banks and credit cards was launched in the Philippines in 1999 simultaneously by mobile operators Globe and Smart. The first content sold to mobile phones was the ringing tone, first launched in 1998 in Finland. The first full internet service on mobile phones was i-Mode introduced by NTT DoCoMo in Japan in 1999.
In 2001 the first commercial launch of 3G (Third Generation) was again in Japan by NTT DoCoMo on the WCDMA standard.[citation needed][52]
Until the early 1990s, most mobile phones were too large to be carried in a jacket pocket, so they were typically installed in vehicles as car phones. With the miniaturization of digital components and the development of more sophisticated batteries, mobile phones have become smaller and lighter.
In the 2000s, video and TV services are driving forward third generation (3G) deployment. In the future, low cost, high speed data may drive forward the fourth generation (4G) as short-range communication emerges. Service and application ubiquity, low cost data delivery, and a high degree of personalization and synchronization between various user appliances will be drivers. At the same time, the radio access network may evolve from a centralized architecture to a distributed one.[citation needed]
[edit] Terminology
[edit] Related non-mobile-phone systems
Car phone
A type of telephone permanently mounted in a vehicle, these often have more powerful transmitters, an external antenna and loudspeaker for handsfree use. They usually connect to the same networks as regular mobile phones.
Cordless telephone (portable phone)
Cordless phones are telephones which use one or more radio handsets in place of a wired handset. The handsets connect wirelessly to a base station, which in turn connects to a conventional land line for calling. Unlike mobile phones, cordless phones use private base stations (belonging to the land-line subscriber), and which are not shared.
Professional Mobile Radio
Advanced professional mobile radio systems can be very similar to mobile phone systems. Notably, the IDEN standard has been used as both a private trunked radio system as well as the technology for several large public providers. Similar attempts have even been made to use TETRA, the European digital PMR standard, to implement public mobile networks.
Radio phone
This is a term which covers radios which could connect into the telephone network. These phones may not be mobile; for example, they may require a mains power supply, they may require the assistance of a human operator to set up a PSTN phone call.
Satellite phone
This type of phone communicates directly with an artificial satellite, which in turn relays calls to a base station or another satellite phone. A single satellite can provide coverage to a much greater area than terrestrial base stations. Since satellite phones are costly, their use is typically limited to people in remote areas where no mobile phone coverage exists, such as mountain climbers and mariners in the open sea.
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