Mobile phone

Un article de Vev.

Modèle:Redirect The mobile phone, cellular phone, or simply cell phone is a long-range, portable electronic device used for mobile communication that uses a network of specialized base stations known as cell sites. In addition to the standard voice function of a telephone, current mobile phones can support many additional services such as SMS for text messaging, email, packet switching for access to the Internet, 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).

Modèle:Table Mobile phone standards

History

Main article: History of mobile phones

wgbush.com/splncs/splncs15.pdf |format=PDF |title=Special History Issue |journal=speleonics 15 |volume=IV |issue=3 |date=October 1990}}</ref> However, the introduction of cells for mobile phone base stations, invented in 1947 by Bell Labs engineers at AT&T, was 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. 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]}//wgbush.com/splncs/splncs15.pdf |format=PDF |title=Special History Issue |journal=speleonics 15 |volume=IV |issue=3 |date=October 1990}}</ref> However, the introduction of cells for mobile phone base stations, invented in 1947 by Bell Labs engineers at AT&T, was 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. 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 telephones, such as Mobile Telephone Service, were not officially categorized as mobile phones, since they did not support the automatic change of channel frequency during calls, which allows the user to move from one cell (the base station coverage area) to another cell, a feature called "handover".^{[citation needed]}

news.bbc.co.uk/1/hi/uk/2963619.stm BBC interview with Martin Cooper]</ref>//news.bbc.co.uk/1/hi/uk/2963619.stm BBC interview with Martin Cooper]</ref>

The first commercial 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) with the Nordic Mobile Telephone (NMT) system in 1981. This was followed by a boom in mobile telephone usage, particularly in Northern Europe.^{[citation needed]}

www.umtsworld.com/umts/history.htm History of UMTS and 3G development]</ref>//www.umtsworld.com/umts/history.htm History of UMTS and 3G development]</ref> 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, mobile phones have become increasingly handy over the years.

Today, video and TV services are driving forward third generation (3G) deployment. And in the future, low cost, high speed data will driveforward the fourth generation (4G) as short-range communication emerges.Service and application ubiquity, with a high degree of personalization and synchronization between various user appliances,will be another driver. At the same time, it is probable that the radio access network will evolve from a centralized architecture to a distributed one.

Recycling

www.TradeMyCell.com|title=phone recycling | publisher = Ruters | date = 2005-03-09}}</ref>offer to remedy to this situation by buying back and recycling cell phones from users.//www.TradeMyCell.com|title=phone recycling | publisher = Ruters | date = 2005-03-09}}</ref>offer to remedy to this situation by buying back and recycling cell phones from users.

Manufacturers

www.nokia.com/link?cid=EDITORIAL_170478 Nokia − Quarterly information, 2007]</ref> Other mobile phone manufacturers include Apple Inc., Audiovox (now UT Starcom), Benefon, BenQ-Siemens, High Tech Computer Corporation (HTC), Fujitsu, Kyocera, LG Mobile, Mitsubishi, Motorola, NEC, Neonode, Panasonic (Matsushita Electric), Pantech Curitel, Philips, Research In Motion, Sagem, Samsung, Sanyo, Sharp, Siemens, Sierra Wireless, SK Teletech, Sonim Technologies, Sony Ericsson, T&A Alcatel, and Toshiba. There are also specialist communication systems related to (but distinct from) mobile phones.//www.nokia.com/link?cid=EDITORIAL_170478 Nokia − Quarterly information, 2007]</ref> Other mobile phone manufacturers include Apple Inc., Audiovox (now UT Starcom), Benefon, BenQ-Siemens, High Tech Computer Corporation (HTC), Fujitsu, Kyocera, LG Mobile, Mitsubishi, Motorola, NEC, Neonode, Panasonic (Matsushita Electric), Pantech Curitel, Philips, Research In Motion, Sagem, Samsung, Sanyo, Sharp, Siemens, Sierra Wireless, SK Teletech, Sonim Technologies, Sony Ericsson, T&A Alcatel, and Toshiba. There are also specialist communication systems related to (but distinct from) mobile phones.

The mobile phone manufacturers can be grouped into two. The top five are available in practically all countries and comprise about 75% of all phones sold. A second tier of small manufacturers exists with phones mostly sold only in specific regions or for niche markets. The top five in order of market share are Nokia, Samsung, Motorola, SonyEricsson and LG.

Subscriptions

Modèle:See also www.cia.gov/library/publications/the-world-factbook/geos/uk.html#Comm CIA World Factbook - UK]</ref> There are over five hundred million active mobile phone accounts in China, as of 2007.<ref>Modèle:Cite web www.fws.gov/habitatconservation/communicationtowers.htm//www.itfacts.biz/index.php?id=P8549</ref> Luxembourg has the highest mobile phone penetration rate in the world, at 164% in December 2001. In Hong Kong the penetration rate reached 139.8% of the population in July 2007.<ref name="OFTA">[1], Office of the Telecommunications Authority, Hong Kong.</ref> The total number of mobile phone subscribers in the world was estimated at 2.14 billion in 2005.<ref>Modèle:Cite newswww.fws.gov/habitatconservation/communicationtowers.htm//www.mobiletracker.net/archives/2005/05/18/mobile-subcribers-worldwide</ref> The subscriber count reached 2.7 billion by end of 2006 according to Informa^{[citation needed]}, and 3.3 billion by November, 2007<ref>global cellphone penetration reaches 50 percent</ref>, thus reaching an equivalent of over half the planet's population. Around 80% of the world's population enjoys mobile phone coverage as of 2006. This figure is expected to increase to 90% by the year 2010.<ref>Up to 90 percent of globe to have mobile coverage</ref>//www.cia.gov/library/publications/the-world-factbook/geos/uk.html#Comm CIA World Factbook - UK]</ref> There are over five hundred million active mobile phone accounts in China, as of 2007.<ref>Modèle:Cite web www.fws.gov/habitatconservation/communicationtowers.htm//www.itfacts.biz/index.php?id=P8549</ref> Luxembourg has the highest mobile phone penetration rate in the world, at 164% in December 2001. In Hong Kong the penetration rate reached 139.8% of the population in July 2007.<ref name="OFTA">[2], Office of the Telecommunications Authority, Hong Kong.</ref> The total number of mobile phone subscribers in the world was estimated at 2.14 billion in 2005.<ref>Modèle:Cite newswww.fws.gov/habitatconservation/communicationtowers.htm//www.mobiletracker.net/archives/2005/05/18/mobile-subcribers-worldwide</ref> The subscriber count reached 2.7 billion by end of 2006 according to Informa^{[citation needed]}, and 3.3 billion by November, 2007<ref>global cellphone penetration reaches 50 percent</ref>, thus reaching an equivalent of over half the planet's population. Around 80% of the world's population enjoys mobile phone coverage as of 2006. This figure is expected to increase to 90% by the year 2010.<ref>Up to 90 percent of globe to have mobile coverage</ref>

news.bbc.co.uk/2/hi/business/4331863.stm|title=Mobile growth fastest in Africa | publisher = BBC News Online | date = 2005-03-09}}</ref> its markets expanding nearly twice as fast as Asian markets.<ref>Modèle:Cite newswww.fws.gov/habitatconservation/communicationtowers.htm//www.timesonline.co.uk/article/0,,3-2068420,00.html</ref>//news.bbc.co.uk/2/hi/business/4331863.stm|title=Mobile growth fastest in Africa | publisher = BBC News Online | date = 2005-03-09}}</ref> its markets expanding nearly twice as fast as Asian markets.<ref>Modèle:Cite newswww.fws.gov/habitatconservation/communicationtowers.htm//www.timesonline.co.uk/article/0,,3-2068420,00.html</ref> 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 to a monumental scale in Africa as well as in other continents.

www.trai.gov.in/trai/upload/PressReleases/511/pr22nov07no96.pdf]|73.6 KiB}}</ref> With 256.55 million cell phones, market penetration in the country is still low at 22.52%. India expects to reach 500 million subscribers by end of 2010.//www.trai.gov.in/trai/upload/PressReleases/511/pr22nov07no96.pdf]|73.6 KiB}}</ref> With 256.55 million cell phones, market penetration in the country is still low at 22.52%. India expects to reach 500 million subscribers by end of 2010.

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, African 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, India, Japan, and South Korea 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.

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, Japan and Finland are among the rare countries left where most phones are still contract-based.

Culture and customs

www.point.com/articles/2006/04/cell_phones_for.php Cell Phones for Kids Under 15: a Responsible Question]</ref> In many young adults' households it has supplanted the land-line telephone. The mobile phone is banned in some countries, such as North Korea.<ref>"

   Rise in executions for mobile use 
     
 " , ITV News , June 15, 2007
 
  . Retrieved on 2007-06-23
 . </ref>//www.point.com/articles/2006/04/cell_phones_for.php Cell Phones for Kids Under 15: a Responsible Question]</ref> In many young adults' households it  has supplanted the land-line telephone. The mobile phone is banned in some countries, such as North Korea.<ref>"
   Rise in executions for mobile use 
     
 " , ITV News , June 15, 2007
 
  . Retrieved on 2007-06-23
 . </ref>

Given the high levels of societal mobile telephone service penetration, it is a key means for people to communicate with each other. The SMS feature spawned the "texting" sub-culture.^{[citation needed]} 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 telephones 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. In Europe, 30–40 per cent of internet access is via mobile telephone. 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 telephone can be a fashion totem custom-decorated to reflect the owner's personality. This aspect of the mobile telephony business is, in itself, an industry, e.g. ringtone sales exceeded $5 billion in 2006, per Informa.^{[citation needed]}

Etiquette

Mobile telephone use in etiquette is an important matter of social discourtesy, phones ringing during funerals, weddings, in toilets, cinemas, and plays. Users often speak loudly, leading to book shops, libraries, bathrooms, cinemas, doctors' offices, and houses of worship prohibiting their uses, and, in some places, the installation of signal-jamming equipment to prevent their use (though in many countries, including the U.S., such equipment is currently illegal). Some new buildings, such as auditoriums, have installed wire mesh in the walls (making it a Faraday cage), which prevents signal penetration without violating signal jamming laws.

Trains, particularly those involving long-distance services, often offer a "quiet car" where phone use is prohibited, much like the designated non-smoking car in the past. However many users tend to ignore this as it is rarely enforced, especially if the other cars are crowded and they have no choice but to go in the "quiet car". 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 about cell phones is partially based on the crash of Crossair Flight 498.

As of 2007, several airlines are experimenting with base station and antenna systems installed to the airplane, allowing low power, short-range connection of any phones aboard to remain connected to the aircraft's base station.^{[citation needed]} 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 traveling 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 airplane 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]}

news.yahoo.com/s/ap/20070403/ap_on_hit_te/cell_phones_airplanes FCC says 'no' to cell phones on planes]. Yahoo News, April 3, 2007.</ref>//news.yahoo.com/s/ap/20070403/ap_on_hit_te/cell_phones_airplanes FCC says 'no' to cell phones on planes]. Yahoo News, April 3, 2007.</ref>

news.bbc.co.uk/1/hi/education/4448167.stm |title=Exams ban for mobile phone users |publisher=BBC News |date=15 April 2005 |accessdate=2007-09-05}}</ref>//news.bbc.co.uk/1/hi/education/4448167.stm |title=Exams ban for mobile phone users |publisher=BBC News |date=15 April 2005 |accessdate=2007-09-05}}</ref>

blog.anta.net/2007/11/04/campaign-promotes-phone-manners/ |title=Campaign promotes phone manners |publisher=blog.anta.net |date=4 Nov 2007 |accessdate=2007-11-04}}</ref>//blog.anta.net/2007/11/04/campaign-promotes-phone-manners/ |title=Campaign promotes phone manners |publisher=blog.anta.net |date=4 Nov 2007 |accessdate=2007-11-04}}</ref>

Use in 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.^{[citation needed]} 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 telephone 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 attacks of 9/11/2001, the Hawaian earthquake, the 2003 Northeast blackouts, Hurricane Katrina, and the 2007 Minnesota bridge collapse. Thus mobile phones are better for isolated emergencies such as vehicle accidents.

Use by drivers

Main article: Mobile phones and driving safety

www.psychologymatters.org/driverdistract.html | title = Driven to distraction | publisher = APA Online}}</ref> A study done by the Transport Research Laboratory found that mobile phone users were four times more likely to be in a collision, regardless of whether the call was hands-free or not. <ref>Hands-Free Can Be As Bad As Drink-Driving</ref> This problem does not apply to conversations with a passenger, as passengers can regulate the flow of conversation according to the perceived level of danger, and also provides a second pair of eyes to spot hazards. <ref name="Crundall"> Modèle:Cite journal</ref>//www.psychologymatters.org/driverdistract.html | title = Driven to distraction | publisher = APA Online}}</ref> A study done by the Transport Research Laboratory found that mobile phone users were four times more likely to be in a collision, regardless of whether the call was hands-free or not. <ref>Hands-Free Can Be As Bad As Drink-Driving</ref> This problem does not apply to conversations with a passenger, as passengers can regulate the flow of conversation according to the perceived level of danger, and also provides a second pair of eyes to spot hazards. <ref name="Crundall"> Modèle:Cite journal</ref>

Applications

news.yahoo.com/you-witness-news You Witness News]</ref> and small independent news companies such as Jasmine News in Sri Lanka. Companies like Monster<ref>Monster Mobile</ref> 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.//news.yahoo.com/you-witness-news You Witness News]</ref> and small independent news companies such as Jasmine News in Sri Lanka. Companies like Monster<ref>Monster Mobile</ref> 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.

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.

Power

Mobile phones generally obtain power from batteries which can be recharged from mains power, a USB port or a cigarette lighter socket in a car. Formerly, the most common form of cell 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. Cell phone manufacturers have been experimenting with alternate power sources, including solar cells. Modèle:Sectstub

Features

Main article: Mobile phone features

There are significant questions as to who first invented the camera phone, as numerous other people received patents filed in the early 1990s for the device, including David M. Britz of AT&T Research in March of 1994 and Phillipe Kahn, who claims to have first invented it in 1997.^{[citation needed]} The camera phone now holds 85% of the mobile phone market^{[citation needed]}. Mobile phones often have features beyond sending text messages and making voice calls, including Internet browsing, music (MP3) playback, memo recording, personal organizer 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 (e.g. Final Fantasy Agito).^{[citation needed]}

Tariff models

Modèle:See also 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 (or, more correctly, "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 are 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, including Syria, European Union nations, United Arab Emirates, Kazakhstan, Turkey, New Zealand, Korea, Japan, Pakistan, Australia, Brazil, Chile, Colombia, India,<ref name="SCMP" /> Maldives, Malaysia, Peru, South Africa, Israel, Lebanon, Egypt and Jordan the person receiving a mobile phone call pays nothing. However, in Hong Kong, Canada, and the United States, one can be charged per minute. In the United States, 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.<ref name="SCMP">Amy Gu, "Mainland mobile services to be cheaper", South China Morning Post, December 18, 2006, Page A1. </ref>

Developing countries

www.sunherald.com/business/story/134849.html|title=Cell phone use booming worldwide| date=September 15, 2007|accessdate=2007-09-15}}</ref>. The rise of cell phone technology in developing countries is often cited as an example of the leapfrog effect. In many remote regions in the third world went literally from having no telecommunications infrastructure to having satellite based communications systems.//www.sunherald.com/business/story/134849.html|title=Cell phone use booming worldwide| date=September 15, 2007|accessdate=2007-09-15}}</ref>. The rise of cell phone technology in developing countries is often cited as an example of the leapfrog effect. In many remote regions in the third world went literally from having no telecommunications infrastructure to having satellite based communications systems.

Forensics and evidence

www.securitytaskforce.eu/dmdocuments/d3_3_final_strategy_report_v1_0.pdf ICT Security & Dependability Research beyond 2010: Final strategy]|1.37 MiB}}</ref>. 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 telephone devices, prompting leading mobile telephone forensic specialists to identify forensic techniques available in this area.<ref>Supplementary memorandum submitted by Gregory Smith</ref> NIST have published guidelines and procedures for the preservation, acquisition, examination, analysis, and reporting of digital information present on cell phones can be found under the NIST Publication SP800-101.<ref>Modèle:PDFlink, Recommendations of the National Institute of Standards and Technology, May 2007.</ref>//www.securitytaskforce.eu/dmdocuments/d3_3_final_strategy_report_v1_0.pdf ICT Security & Dependability Research beyond 2010: Final strategy]|1.37 MiB}}</ref>. 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 telephone devices, prompting leading mobile telephone forensic specialists to identify forensic techniques available in this area.<ref>Supplementary memorandum submitted by Gregory Smith</ref> NIST have published guidelines and procedures for the preservation, acquisition, examination, analysis, and reporting of digital information present on cell phones can be found under the NIST Publication SP800-101.<ref>Modèle:PDFlink, Recommendations of the National Institute of Standards and Technology, May 2007.</ref>

An 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.^{[citation needed]}

Human health impacts

Main article: Mobile phone radiation and health

www.cqs.com/cell.htm | title = Cellular Phones and Cancer | accessdate = 2007-03-02 | last = Campbell | first = Jonathan}}</ref> As mobile phone penetrations grew past fixed landline penetration levels in 1998 in Finland and from 1999 in Sweden, Denmark and Norway, the Scandinavian health authorities have run continuous long term studies of effects of mobile phone radiation effects to humans, and in particular children. Numerous studies have reported and most studies consistently report no significant relationship between mobile phone use and health. Studies from the Institute of Cancer Research, National Cancer Institute and researchers at the Danish Institute of Cancer Epidemiology in Copenhagen for example showed no link between mobile phone use and cancer.<ref>Cell Phones Don't Cause Brain Tumors, Study Says</ref><ref>No Risk of Cancer using Cell Phone</ref> The Danish study only covered analog mobile phone usage up through 1995, and subjects who started mobile phone usage after 1995 were counted as non-users in the study.<ref> Hobson , Katherine

  . 
 "
   Study Finds No Link Between Cellphones and Cancer 
     
 " , U.S. News and World Report , 2006-12-07
 
  . Retrieved on 2007-03-02
 . </ref> The health concerns have grown as mobile phone penetration rates throughout Europe reached 80%–90% levels earlier in this decade and prolonged exposure studies have been carried out in almost all European countries again most reporting no effect, and the most alarming studies only reporting a possible effect. However, a study by the International Agency for Research on Cancer of 4,500 users found a statistically significant link between tumor frequency and mobile phone use.<ref>Europe cell phone study focuses on tumors</ref>//www.cqs.com/cell.htm | title = Cellular Phones and Cancer | accessdate = 2007-03-02 | last = Campbell | first = Jonathan}}</ref> As mobile phone penetrations grew past fixed landline penetration levels in 1998 in Finland and from 1999 in Sweden, Denmark and Norway, the Scandinavian health authorities have run continuous long term studies of effects of mobile phone radiation effects to humans, and in particular children. Numerous studies have reported and most studies consistently report no significant relationship between mobile phone use and health. Studies from the Institute of Cancer Research, National Cancer Institute and researchers at the Danish Institute of Cancer Epidemiology in Copenhagen for example showed no link between mobile phone use and cancer.<ref>Cell Phones Don't Cause Brain Tumors, Study Says</ref><ref>No Risk of Cancer using Cell Phone</ref>  The Danish study only covered analog mobile phone usage up through 1995, and subjects who started mobile phone usage after 1995 were counted as non-users in the study.<ref>   Hobson , Katherine 
       
   
  . 
 "
   Study Finds No Link Between Cellphones and Cancer 
     
 " , U.S. News and World Report , 2006-12-07
 
  . Retrieved on 2007-03-02
 . </ref> The health concerns have grown as mobile phone penetration rates throughout Europe reached 80%–90% levels earlier in this decade and prolonged exposure studies have been carried out in almost all European countries again most reporting no effect, and the most alarming studies only reporting a possible effect. However, a study by the International Agency for Research on Cancer of 4,500 users found a statistically significant link between tumor frequency and mobile phone use.<ref>Europe cell phone study focuses on tumors</ref>

www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=17482179&ordinalpos=4&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum Effect of cell phone usage on semen analysis in men attending infertility clinic: an observational study.]</ref> A prospective study of 13 normal men found that significantly increasing their cell phone use (>6 hours each day for 5 days) caused a marked reduction of sperm quality. <ref>M. Davoudi, C. Brossner and W. Kuber, The influence of electromagnetic waves on sperm motility, Urol Urogynaecol 19 (2002), pp. 18–22</ref>//www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=17482179&ordinalpos=4&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum Effect of cell phone usage on semen analysis in men attending infertility clinic: an observational study.]</ref> A prospective study of 13 normal men found that significantly increasing their cell phone use (>6 hours each day for 5 days) caused a marked reduction of sperm quality. <ref>M. Davoudi, C. Brossner and W. Kuber, The influence of electromagnetic waves on sperm motility, Urol Urogynaecol 19 (2002), pp. 18–22</ref>

www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet56/oet56e4.pdf</ref> The eyes are the other part of the body known to be poor at dissipating heat. Experiments have shown that short duration exposure to very high levels of RF radiation can cause cataracts in rabbits. <ref>http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet56/oet56e4.pdf page 7</ref> The non-thermal effects of RF radiation are an area of active study.//www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet56/oet56e4.pdf</ref> The eyes are the other part of the body known to be poor at dissipating heat. Experiments have shown that short duration exposure to very high levels of RF radiation can cause cataracts in rabbits. <ref>http://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet56/oet56e4.pdf page 7</ref> The non-thermal effects of RF radiation are an area of active study.

www.cnn.com/2007/WORLD/asiapcf/11/28/phone.explosion.ap/index.html</ref> but it was later discovered to be a lie.<ref>http://english.chosun.com/w21data/html/news/200711/200711300015.html</ref>//www.cnn.com/2007/WORLD/asiapcf/11/28/phone.explosion.ap/index.html</ref> but it was later discovered to be a lie.<ref>http://english.chosun.com/w21data/html/news/200711/200711300015.html</ref>

Environmental impacts

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.<ref> {{cite web

 www.fws.gov/habitatconservation/communicationtowers.htm//www.fws.gov/habitatconservation/communicationtowers.htm 
 |title=Communication Towers and the Fish and Wildlife Service
 |accessdate=2007-09-26
 |publisher=U.S. Fish and Wildlife Service

}}</ref>

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.<ref>"

   Are mobile phones wiping out our bees?
   
 " , The Independentwww.fws.gov/habitatconservation/communicationtowers.htm//news.independent.co.uk/environment/wildlife/article2449968.ece
  , 15 April, 2007
 
 . </ref>

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".<ref> {{cite news

 www.fws.gov/habitatconservation/communicationtowers.htm//www.iht.com/articles/2007/04/22/news/wireless23.php 
 |title=Wireless: Case of the disappearing bees creates a buzz about cellphones
 |author=Eric Sylvers
 |date=April 22, 2007
 |publisher=International Herald Tribune

}}</ref><ref>

  Chloe Johnson
     
   
  . 
 "
   Researchers: Often-cited study doesn't relate to bee colony collapse
 www.fws.gov/habitatconservation/communicationtowers.htm//www.fosters.com/apps/pbcs.dll/article?AID=/20070422/FOSTERS01/104220119/0/CITIZEN
   
 " , Foster's Online
  , April 22, 2007
 
 . </ref><ref>

"

   Cellphone researchers claim data misinterpreted
 www.fws.gov/habitatconservation/communicationtowers.htm//colonycollapse.org/content/view/23/33/
   
 " , ColonyCollapse.org
 
 . </ref>

While the initial claim of damage to bees was widely reported, the corrections to the story were almost non-existent in the media.

Technology

Modèle:Seealso

Mobile phones and the network they operate under vary significantly from provider to provider, and country to country. However, all of them communicate through electromagnetic radio waves with a cell site base station, the antennas of which are usually mounted on a tower, pole or building.

The phones have a low-power transceiver that transmits voice and data to the nearest cell sites, usually 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 will 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. As the user moves around the network, the mobile device will "handoff" to various cell sites during calls, or while waiting (idle) between calls it will reselect cell sites.

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 digitized 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. Third-generation networks, which are still being deployed, started with Japan in 2001, 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 3G technlogy on the TD-SCDMA standard. Each network operator has a unique radio frequency band.^{[citation needed]}

Books about mobile communication

Since 2002, many books have been written on the social impact of mobile phones:

• Agar, Jon, Constant Touch: A Global History of the Mobile Phone, 2004 ISBN 1840465417
• Ahonen, Tomi, m-Profits: Making Money with 3G Services, 2002, ISBN 0-470-84775-1
• Ahonen, Kasper and Melkko, 3G Marketing 2004, ISBN 0-470-85100-7
• Glotz, Peter & Bertsch, Stefan, eds. Thumb Culture: The Meaning of Mobile Phones for Society, 2005
• Katz, James E. & Aakhus, Mark, eds. Perpetual Contact: Mobile Communication, Private Talk, Public Performance, 2002
• Kavoori, Anandam & Arceneaux, Noah, eds. The Cell Phone Reader: Essays in Social Transformation, 2006
• Levinson, Paul, Cellphone: The Story of the World's Most Mobile Medium, and How It Has Transformed Everything!, 2004 ISBN 1-4039-6041-0

www.richardling.com/ Ling, Rich], The Mobile Connection: the Cell Phone's Impact on Society, 2004 ISBN 1558609369//www.richardling.com/ Ling, Rich], The Mobile Connection: the Cell Phone's Impact on Society, 2004 ISBN 1558609369

• Ling, Rich and Pedersen, Per, eds. Mobile Communications: Re-negotiation of the Social Sphere, 2005 ISBN 1852339314
• Nyíri, Kristóf, ed. Mobile Communication: Essays on Cognition and Community, 2003
• Nyíri, Kristóf, ed. Mobile Learning: Essays on Philosophy, Psychology and Education, 2003
• Nyíri, Kristóf, ed. Mobile Democracy: Essays on Society, Self and Politics, 2003
• Nyíri, Kristóf, ed. A Sense of Place: The Global and the Local in Mobile Communication, 2005
• Nyíri, Kristóf, ed. Mobile Understanding: The Epistemology of Ubiquitous Communication, 2006

www.motorola.com/mot/doc/0/234_MotDoc.pdf on the mobile – the effects of mobile telephones on social and individual life], 2001//www.motorola.com/mot/doc/0/234_MotDoc.pdf on the mobile – the effects of mobile telephones on social and individual life], 2001

• Rheingold, Howard, Smart Mobs: The Next Social Revolution, 2002 ISBN 0738208612

Terminology

Related non-mobile-phone systems

Cordless telephone (portable phone) 

Cordless phones are standard telephones with radio handsets. Unlike mobile phones, cordless phones use private base stations that are not shared between subscribers. The base station is connected to a land-line. Increasingly, with wireless local loop technologies, namely DECT, the distinction is blurred.

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. Also, 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. Satellite phones are often used in remote areas where no mobile phone coverage exists and at sea.

Terms in various countries

Modèle:See

See also

Modèle:Wiktionary Modèle:Wiktionary

References

Modèle:Mobile phonesModèle:Link FA

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