Mobile phone
 |
Mobile phones from various years |
A
mobile phone or
cellular (
cell)
phone is an electronic
telecommunications device. 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 are
satellite phones). Cellular networks were first introduced in the early to mid 1980s (the
1G generation). Prior mobile phones operating without a cellular network (the so-called
0G generation), such as
Mobile Telephone Service, date back to 1946. Until the mid to late 1980s, most mobile phones were sufficiently large that they were permanently installed in vehicles as
car phones. With the advance of
miniaturization, currently the vast majority of mobile phones are handheld. In addition to the standard voice function of a
telephone, a mobile phone can support many additional
services such as
SMS for text messaging,
packet switching for access to the
Internet, and
MMS for sending and receiving photos and video.
The world's largest mobile phone manufacturers include
Alcatel,
Audiovox,
BenQ-Siemens,
Dopod,
Fujitsu,
Kyocera,
LG,
Motorola,
NEC,
Nokia,
Panasonic (Matsushita Electric),
Pantech Curitel,
Philips,
Sagem,
Samsung,
Sanyo,
Sharp,
SK Teletech,
Sony Ericsson and
Toshiba.
The world's largest mobile phone operators include
Orange SA and
Vodafone.
There are also specialist communication systems related to, but distinct from mobile phones, such as
Professional Mobile Radio. Mobile phones are also distinct from
cordless telephones, which generally operate only within a limited range of a specific base station. Technically, the term
mobile phone includes such devices as
satellite phones and pre-cellular mobile phones such as those operating via
MTS which do not have a
cellular network, whereas the related term
cell(ular) phone does not. In practice, the two terms are used nearly interchangeably, with the preferred term varying by location.
|
Mock-up of the "portable phone of the future", from a mid-60s Bell System advertisement, shows a device not too different from today's mobile telephones. |
Radio phones have a
long and varied history that stretches back to the 1950s, with hand-held cellular radio devices being available since 1983. 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.
In most of
Europe, wealthier parts of
Asia,
Africa, the
Caribbean,
Latin America,
Australia,
Canada, and the
United States, mobile phones are now widely used, with the majority of the adult, teenage, and even child population owning one. At present
India and
China have the largest growth rates of cellular subscribers in the world.The availability of
Prepaid or
pay as you go services, where the subscriber does not have to commit to a long term contract, has helped fuel this growth on a monolithic scale.
The mobile phone has become ubiquitous because of the interoperability of mobile phones across different networks and countries. This is due to the equipment manufacturers working to meet one of a few standards, particularly the
GSM standard which was designed for Europe-wide interoperability. All European nations and most Asian and African nations adopted it as their sole standard. In other countries, such as the
United States,
Japan, and
South Korea, legislation does not require any particular standard, and GSM coexists with other standards, such as
CDMA and
iDen.
In less than twenty years, mobile phones have gone from being rare and expensive pieces of equipment used by businesses to a pervasive low-cost personal item. In many countries, mobile phones now outnumber land-line telephones, with most adults and many children now owning mobile phones. It is not uncommon for young adults to simply own a mobile phone instead of a land-line for their residence. In some developing countries, where there is little existing fixed-line infrastructure, the mobile phone has become widespread. According to the
CIA World Factbook the UK now has more mobile phones than people [https://www.cia.gov/cia/publications/factbook/geos/uk.html#Comm].
With high levels of mobile telephone penetration, a mobile culture has evolved, where the phone becomes a key social tool, and people rely on their mobile phone address book to keep in touch with their friends. Many people keep in touch using
SMS, and a whole culture of "
texting" has developed from this. The commercial market in SMS's is growing. Many phones even offer Instant Messenger services to increase the simplicity and ease of texting on phones. Cellular phones in
Japan, offering Internet capabilities such as
NTT DoCoMo's
i-mode, offer text messaging via standard e-mail.
The mobile phone itself has also become a
totemic and
fashion object, with users decorating, customizing, and accessorizing their mobile phones to reflect their personality. This has emerged as its own industry. The sale of commercial
ringtones exceeded $2.5 billion in 2004 [
1].
|
The use of a mobile phone is prohibited in some rail carriages |
Mobile phone etiquette has become an important issue with mobiles ringing at funerals, weddings, movies, and plays. Users often speak at increased volume which has led to places like bookshops, libraries, movie theatres, doctor's offices, and houses of worship posting signs prohibiting the use of mobile phones, sometimes even installing illegal jamming equipment to prevent them. Many rail companies, particularly those providing long-distance services, offer a "quiet car" where phone use is prohibited, much like the designated non-smoking cars in the past.
Mobile phone use on aircraft is also prohibited, because of concerns of possible interference with aircraft radio communications [
2]. Most schools in the U.S prohibit cell phones due to the high amount of class disruptions due to their use, and due to the possibility of photographing someone (without consent).
Camera phones and videophones that can capture video and take photographs are increasingly being used to cover breaking news. Stories like the
London Bombings, the Indian Ocean
Tsunami and
Hurricane Katrina have been reported on by camera phone users on photo sharing sites like
Flickr.
In Japan, cellular phone companies provide immediate notification of
earthquakes and other natural disasters to their customers free of charge. 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.
Mobile phones often have features beyond sending text messages and making voice callsâ€"including Internet browsing, music (
MP3) playback, personal organizers,
e-mail, 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, and serving as a
wireless modem for a PC.
Mobile phones and the network they operate under vary significantly from provider to provider, and even from nation to nation. 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 .5 to 8 miles (0.8 to 13 kilometres) away. When the cellular 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 new 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.
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. Some technologies include
AMPS for analog, and
TDMA,
CDMA,
GSM,
GPRS,
EV-DO, and
UMTS for digital communications. Each network operator has a unique
radio frequency band.
Health controversy
As with many new technologies, concerns have arisen about the effects on health from using a mobile telephone. There is a small amount of scientific evidence for an increase in certain types of rare
tumors (
cancer) in long-time, heavy users. More recently a pan-European study provided significant evidence of damage under certain conditions. Some researchers also report the mobile phone industry has interfered with further research on health risks. So far, however, the
World Health Organization Task Force on EMF effects on health has no definitive conclusion on the veracity of these allegations. (See also
electromagnetic radiation hazard.) It is generally thought, however, that RF is incapable of producing any more than heating effects, as it is considered
non-ionizing radiation; in other words, it lacks the energy to disrupt molecular bonds such as occurs in
genetic mutations.
[Long-term mobile phone use raises brain tumor risk: study, Reuters, 31 March 2006]*
Cell Phone Effects on the EnviromentDriving controversy
Another controversial but more lethal health concern is the correlation with
road traffic accidents. Several studies have shown that motorists have a much higher risk of collisions and losing control of the vehicle while talking on the mobile telephone simultaneously with driving, even when using "
hands-free" systems. Other studies have shown that using a mobile phone while driving poses the same risk as someone operating a vehicle while
under the influence of alcohol. Many countries have now restricted or prohibited the use of mobile phones while driving.
Potential danger during electrical storms
In 2006, it was reported [
3] that mobile phone users suffer much more serious lesions than non-users, in case of being struck by
lightning during an
electrical storm.
Security concerns
Early mobile phones were limited in their security features. Some problems with these models were "cloning", a variant of
identity theft, and "scanning" whereby third parties in the local area could intercept and eavesdrop in on calls. Analogue phones could also be listened to on some radio scanners.
Although more recent digital systems (such as
GSM) have attempted to address these fundamental issues, security problems continue to persist. Vulnerabilities (such as
SMS spoofing) have been found in many current protocols that continue to allow the possibility of eavesdropping or cloning
[GSM Cloning].
Terrorism
The
Madrid bombings were set off by mobile devices in 2004. During the
7 July 2005 London bombings the mobile network was disabled by the authorities who tried to pre-empt the use of this type of threat.
Over the last five years there has been an enormous increase in academic research regarding the social impact of the use of mobile phones. See
Mobile Communication Studies.
There is a great deal of active research and development into mobile phone technology that is currently underway. Some of the improvements that are being worked on are:
*Now that operators are upgrading their networks to advanced wireless and other third-generation (3G) services, many new entertainment and communications services are becoming available, including new broadcast-type operations on spectrum formerly occupied by Television Channels 52-69. With downlink speeds comparable to that of wireline DSL, mobile service can now offer capabilities such as streaming video sharing and music downloads. Services such as MobiTV or Juice Caster are just some examples of applications that leverage these new networks.
* One difficulty in adapting mobile phones to new uses is
form factor. For example,
ebook readers may well become a distinct device, because of conflicting form-factor requirements — ebook readers require large screens, while phones need to be smaller. However, this may be solved using folding
e-paper or built-in
projectors.
* One function that would be useful in phones is a
translation function. Currently it is only available in stand-alone devices, such as Ectaco translators.
* An important area of evolution relates to the Man Machine Interface. New solutions are being developed to create new MMI more easily and let manufacturers and operators experiment new concepts. Examples of companies that are currently developing this technology are
Digital Airways with the Kaleido product,
e-sim,
mobile arsenal, and
Qualcomm with UIOne for the
BREW environment.
* Mobile phones will include various speech technologies as they are being developed. Many phones already have rudimentary
speech recognition in a form of voice dialing. However, to support more natural speech recognition and translation, a drastic improvement in the state of technology in these devices is required.
* New technologies are being explored that will utilize the
Extended Internet and enable mobile phones to treat a
barcode as a
URL tag. Phones equipped with barcode reader-enabled cameras will be able to snap photos of barcodes and direct the user to corresponding sites on the Internet. This technology can be extended to
RFID tags, or even snapped pictures of company logos. Searches can also be personalized to local areas using a
GPS system built in to cell phones. Examples of companies that are currently developing this technology are Nextcode, OP3, Neomedia Technologies, and Scanbuy, the latter of which is currently being sued by Neomedia for patent infringement. Another approach (used by
jumptag.com) is to map
URLs to short text tags tailored for easy user entry on phone keypads.
* Developments in miniaturized
hard disks and
flash drives to solve the storage space issue are already surfacing, therefore opening a window for phones to become portable music libraries and players similar to the
iPod.
* Developments in
podcast software enables mobile phones to become podcast playback devices through existing channels like
MMS Podcast,
J2ME Podcast and
AMR-NB Podcast.
* The emergence of integration capabilities with other unlicensed access technologies such as a WiMAX and WLAN, as well as allowing handover between traditional operator networks supporting GSM, CDMA and UMTS to unlicensed mobile networks. The new standard (
UMA) has been developed for this to move towards
fixed mobile convergence.
* Further improvements in
battery life will be required. Colour screens and additional functions put increasing demands on the device's power source, and battery developments may not proceed sufficiently fast to compensate. However, different display technologies, such as
OLED displays, e-paper, or retinal displays, and smarter communication hardware (
directional antennae, multi-mode, and peer-to-peer phones) may reduce power requirements, while new power technologies such as
fuel cells may provide better energy capacity.
* New technology in Japan has combined the
RFID chip principle into the handset and hooked it up to a network of readers and interfaces. The system, pioneered by NTT DoCoMo and SonyEricsson, is called
FeliCa and there are around 10,000 convenience stores where one can now use a phone to pay for goods just by 'swiping' it over a flat reader. By charging up a phone with pre-paid cash credits, it can act as a sophisticated mobile-phone wallet. The technology is proving popular and there are now even vending machines that accept this form of payment.
* The delivery of multimedia and broadcast content including video to mobiles is beginning to become a reality with the rollout of Qualcomm's MediaFLO. In addition, there are two main competing standards
DMB - Digital Multimedia Broadcasting - and
DVB-H - a handset version of the Digital Video Broadcasting standard. These methods avoid swamping the network by using traditional broadcasting.
*
Image scanning, as seen in existing research [
4] [
5]. With time, this may develop into full 3D texturing and modeling. It is unlikely that cell phones will have the processing power to construct models and textures. But it is likely that the bandwidth to communicate the video, and receive a processed model will exist.
* There are several cell phones that can perform
GPS positioning. In the future, GPS positioning may be coupled with
accelerometer positioning, for covering underground or indoor positioning. This would likely lead to maps and help finding where you are going, and supports social efforts, such as locating friends or group members nearby, and identifying some strangers. The GPS technology already available in some phones, while coupled with the camera phone, may also allow users in the future to not only take a picture, but snap the exact location and angle at which the picture was taken.
Mobile phone terms
; Brick : 1. A large, heavy, and usually obsolete wireless mobile phone such as the
Motorola International 3200. (also
Cinderblock): 2. A mobile phone of a solid form factor. Originally many Nokia models were of this design. (also
candybar)
Clamshell or flip phone : A mobile phone of a form factor resembling the shell of a clam with the ability to open up in the same way. Some earlier flip phones had a small brick-like form factor with a hinge at the bottom of the phone that was attached to a flat piece of plastic which flipped up to cover the keypad but left the display screen exposed.; Slider or slide phone : A mobile phone with a sliding form factor. Usually, the display slides over the keypad to prevent accidental dialing. Some models are designed so that the keypad slides over the display screen.
Cell phone, cellular phone, or cell : Term used currently in the United States and Canada (and in other countries as well during the 1980s) to refer to most mobile phones. It technically applies specifically to mobile phones which use a cellular network. In developing mobile phone technology, American electrical engineers were confronted by the challenge of achieving a smooth handoff from one radio antenna to the next. After the name "cell" was applied to the zone covered by each antenna, it was a natural choice for them to apply the term "cellular" to both the technology and the phones that ran on it.; Handset : A term used by manufacturers to refer to a mobile phone. Also commonly used by industry insiders.
Hands-free car kit : Mobile phone accessory used to talk while keeping hands on the steering wheel.;
Handy : An English word adopted by German speakers to refer to mobile phones.
[Update: Cell Phones in Europe (das Handy) ],
[Am Telefon: Using a Phone in German]Hand phone : Term used currently in Asia-Pacific countries such as South Korea, Singapore, Malaysia, and Indonesia to refer to most mobile phones.;
Keitai : The Japanese word for mobile phone, often used by any one living in Japan.
Mobile phone : A term covering cellular phones, satellite phones and any other phones giving wide-ranging mobility used in most English-speaking countries. In some English-speaking countries such as the United Kingdom and Australia, common usage refers specifically to phones using the cellular network.;
Ringtone : A song or tune that is played to alert the user that a mobile phone is receiving a call.
Satellite phone : A mobile phone which communicates with a satellite rather than a land-based network.; 3G phone : A mobile phone which uses a
third-generation technology network that has greater bandwidth allowing faster data downloads and face-to-face video calling.
Unlock : To enter a code into a GSM phone which has a subsidy lock to one operator so that it will accept a Subscriber Identity Module from another operator.; Wireless phone : A term that generally refers to a
Wi-Fi VoIP phone but is sometimes used by the mobile phone industry to describe mobile phones.
Related systems which are not cell phones
;
Cordless phone (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.
Professional Mobile Radio : Professional mobile radio systems are very similar to cell phone systems and attempts have even been made to use TETRA, the international digital PMR standard, to implement public mobile networks, but normally PMR systems are sufficiently separate from the phone network to not really be considered phones but rather radios.; 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.
Terms in other countries
*
Hong Kong has the highest mobile phone penetration rate in the world, at 125.1% in April 2006.[
6]
* In most countries, when you receive a phone call on your cellular phone you pay nothing. In
Hong Kong and
The United States you are charged per minute in most cases.[
7]
* Cell phone generations:
0G,
1G,
2G,
2.5G,
2.75G,
3G and
4G.
*
Comparison of mobile phone standards*
Signal strength*
History of mobile phones*
Japanese mobile phone culture*
Camera phone*
List of mobile network operators*
Satellite:
Iridium,
Inmarsat*
Location based service and
GSM localization*
Location-based game*
GSM*
GPRS (General Packet Radio Service)
*
Enhanced Data Rates for GSM Evolution (EDGE)*
CDMA2000*
UMTS (Universal Mobile Telecommunications System)
* A comparison of
Mobile development platforms
**
Java ME**
MIDlet**
BREW (Binary Runtime Environment for Wireless)
*
Push to talk*
iDEN (Integrated Digital Enhanced Network)
*
Over The Air Programmable*
Mobile Payment Services Association*
Fixed-line telephony*
Telecommunication* Messages:
SMS,
MMS* Wire and
Wireless Connectivity:
Bluetooth,
bluechat,
bluedating,
wifi,
USB*
Mobile power:
battery, car
lighter,
solar energy*
Marine and mobile radio telephony*
Dropped call*
Microbrowser*
E-waste*
Cellular repeater*
moblog - mobile weblog
*
Wireless Village - cell phone instant messaging protocol
*
WAP Wireless Application Protocol
*
Smartphone*
Music Porter X*
Digital camera integration
*
GPS integration
*
SIM Subscriber Identity Module
*
Mobile publishing*
Multiplayer Mobile games*
Semacode (a new type of
barcode, designed to be easily captured by a mobile phone's camera and converted to an internet
URL for use by the phone's web browser)
*
Mobile phones at the
Open Directory Project*
How Cell Phones Work (
HowStuffWorks)
*
The British Library - finding information on the mobile phone industry*
WikiManuals Mobile phone manuals.
