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					Mobile phone
A mobile phone (also called mobile, cellular telephone, or cell phone) is an electronic device used to
make mobile telephone calls across a wide geographic area. Mobile phones are different from cordless
telephones, which only offer telephone service within a limited range of a fixed land line, for example within a
home or an office.

A mobile phone can make and receive telephone calls to and from the public telephone networkwhich includes
other mobiles and fixed-line phones across the world. It does this by connecting to a cellular network owned by
a mobile network operator.

In addition to being a telephone, modern mobile phones also support many additional services,
and accessories, such as SMS (or text) messages, e-mail, Internet access,
gaming, Bluetoothand infrared short range wireless communication, camera, MMS that offer more advanced
computing ability are referred to as smartphones.

The first handheld mobile phone was demonstrated by Dr. Martin Cooper of Motorola in 1973, using a handset
weighing 2 kg.[1] In 1983, the DynaTAC 8000x was the first to be commercially available. In the twenty years
from 1990 to 2010, worldwide mobile phone subscriptions grew from 12.4 million to over 4.6 billion, penetrating
the developing economies and reaching the bottom of the economic pyramid.[2][3]

edit]History
[


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.

The first mobile telephone call made from a car occurred in St. Louis, Missouri, USA on June 17, 1946, using
the Bell System's Mobile Telephone Service, but the system was impractical from what is considered a portable
handset today. The equipment weighed 80 pounds (36 kg), and theAT&T service, basically a massive party
line, cost $30 USD per month (equal to $337.33 today) plus $.30 to $.40 per local call, equal to $3.37 to $4.5
today.[4]

In 1960, the world’s first partly automatic car phone system, Mobile System A (MTA), was launched in Sweden.
MTA phones were composed of vacuum tubes and relays, and had a weight of 40 kg. In 1962, a more modern
version called Mobile System B (MTB) was launched, which was a push-button telephone, and which
used transistors in order to enhance the telephone’s calling capacity and improve its operational reliability. In
1971, the MTD version was launched, opening for several different brands of equipment and gaining
commercial success.[5][6]
Martin Cooper, a Motorola researcher and executive is considered to be the inventor of the first practical mobile
phone for handheld use in a non-vehicle setting, after a long race against Bell Labs for the first portable mobile
phone. Using a modern, if somewhat heavy portable handset, Cooper made the first call on a handheld mobile
phone on April 3, 1973 to his rival, Dr. Joel S. Engel of Bell Labs.[7]

The first commercially automated cellular network (the 1G generation) was launched in Japan by NTT in 1979,
initially in the metropolitan area of Tokyo. Within five years, the NTT network had been expanded to cover the
whole population of Japan and became the first nationwide 1G network. In 1981, this was followed by the
simultaneous launch of the Nordic Mobile Telephone (NMT) system
in Denmark, Finland, Norwayand Sweden.[8] NMT was the first mobile phone network featuring
international roaming. The first 1G network launched in the USA was Chicago-based Ameritech in 1983 using
the Motorola DynaTAC mobile phone. Several countries then followed in the early-to-mid 1980s including the
UK, Mexico and Canada.

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.

In 2001, the first commercial launch of 3G (Third Generation) was again in Japan by NTT DoCoMo on
the WCDMA standard.[9]

One of the newest 3G technologies to be implemented is High-Speed Downlink Packet Access (HSDPA). It is
an enhanced 3G (third generation) mobile telephony communications protocol in the High-Speed Packet
Access (HSPA) family, also coined 3.5G, 3G+ or turbo 3G, which allows networks based on Universal Mobile
Telecommunications System (UMTS) to have higher data transfer speeds and capacity.

edit]Features
[

All mobile phones have a number of features in common, but manufacturers also try to differentiate their own
products by implementing additional functions to make them more attractive to consumers. This has led to
great innovation in mobile phone development over the last 20 years.

Low-end mobile phones are often referred to as feature phones, and offer basic telephony, as well as functions
such as playing music and taking photos, and sometimes simple applications based on
generic managed platforms such as Java ME or BREW. Handsets with more advanced computing ability
through the use of native software applications became known as smartphones. The first smartphone was
theNokia 9000 Communicator in 1996 which added PDA functionality to the basic mobile phone at the time. As
miniaturization 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 Nseries of multimedia phones, the Palm
Pre the HTC Dream and the Apple iPhone.

Other features that may be found on mobile phones include GPS navigation, music (MP3) and video (MP4)
playback, RDS radio receiver,alarms, memo recording, personal digital assistant functions, ability to
watch streaming video, video download, video calling, built-in cameras (1.0+ Mpx) and camcorders (video
recording), with autofocus and flash, ringtones, games, PTT, memory card reader (SD), USB (2.0), dual line
support, infrared, Bluetooth (2.0) and WiFi connectivity, instant messaging, Internet e-mail and browsing and
serving as a wireless modem. Nokia and the University of Cambridge demonstrated a bendable cell phone
called the Morph.[10] Some phones can make mobile payments via direct mobile billing schemes or
through contactless payments if the phone and point of sale support Near Field
Communication (NFC).[11] Some of the largest mobile phone manufacturers and network providers along with
many retail merchants support, or plan to support, contactless payments through NFC-equipped mobile
phones.[12][13][14]

[edit]Software        and applications
The most commonly used data application on mobile phones is SMS text messaging. 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.

Other non-SMS data services used on mobile phones include mobile music, downloadable logos and pictures,
gaming, gambling, adult entertainment and advertising. The first downloadable mobile content was sold to a
mobile phone in Finland in 1998, when Radiolinja (now Elisa) introduced the downloadable ringtone 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.

The first mobile news service, delivered via SMS, was launched in Finland in 2000. Mobile news services are
expanding with many organizations providing "on-demand" news services by SMS. Some also provide "instant"
news pushed out by SMS.

Mobile payments were first trialled in Finland in 1998 when two Coca-Cola vending 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.

EU common External Power Supply (EPS)

In 2009, many mobile phone manufacturers signed a Memorandum of Understanding (MoU), agreeing to make
most new data-enabled cell phones marketed in the EU compatible with a common External Power
Supply (EPS). All signatories agreed to develop a common specification for the charger "to allow for full
compatibility and safety of chargers and mobile phones."[20][21] The mobile phone manufacturers who have
agreed to this standard include the original signatories Apple, LG, Motorola, NEC, Nokia, Qualcomm, RIM,
Samsung, Sony Ericsson, and Texas Instruments as well as Atmel, Emblaze Mobile, Huawei
Technologies and TCT Mobile (Alcatel).[22] The Memorandum of Understanding also provides for the use of the
common External Power Supply with compliant phones not equipped with a MicroUSB receptacle: "...4.2.1...if a
manufacturer makes available an Adaptor from the Micro-USB connector of a Common EPS [External Power
Supply] to a specific non-Micro-USB socket in the Mobile Phone, it shall constitute compliance to this article."

Charger efficiency

The majority of energy lost in a mobile phone charger is in its no load condition, when the mobile phone is not
connected but the charger has been left plugged in and using power. To combat this, in November 2008, the
top five mobile phone manufacturers Nokia, Samsung, LG, Sony Ericsson, and Motorola set up a star rating
system to rate the efficiency of their chargers in the no-load condition. Starting at zero stars for >0.5 W and
going up to the top five star rating for <0.03 W (30 mW) no load power.

A number of semiconductor companies offering flyback controllers, such as Power Integrations and CamSemi,
now claim that the five-star standard can be achieved with use of their product.

Battery

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 olderLithium-Ion, the main advantages of this being even
lower weight and the possibility to make the battery a shape other than strict cuboid.[26] Mobile phone
manufacturers have been experimenting with alternative power sources, includingsolar cells.
[edit]SIM    card
GSM mobile phones require a small microchip called a Subscriber Identity Module or SIM Card, to function.
The SIM card is approximately the size of a small postage stamp and is usually placed underneath the battery
in the rear of the unit. The SIM securely stores the service-subscriber key (IMSI) used to identify a subscriber
on mobile telephony devices (such as mobile phones andcomputers). The SIM card allows users to change
phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone or
broadband telephony device.

A SIM card contains its unique serial number, internationally unique number of the mobile user (IMSI), security
authentication and ciphering information, temporary information related to the local network, a list of the
services the user has access to and two passwords (PIN for usual use and PUK for unlocking).

SIM cards are available in three standard sizes. The first is the size of a credit card (85.60 mm × 53.98 mm x
0.76 mm). The newer, most popular miniature version has the same thickness but a length of 25 mm and a
width of 15 mm, and has one of its corners truncated (chamfered) to prevent misinsertion. The newest
incarnation known as the 3FF or micro-SIM has dimensions of 15 mm × 12 mm. Most cards of the two smaller
sizes are supplied as a full-sized card with the smaller card held in place by a few plastic links; it can easily be
broken off to be used in a device that uses the smaller SIM.

The first SIM card was made in 1991 by Munich smart card maker Giesecke & Devrient for the Finnish wireless
network operator Radiolinja. Giesecke & Devrient sold the first 300 SIM cards to Elisa (ex. Radiolinja).

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 there, information can be added, including a new number for the phone, new Service Provider numbers,
new emergency numbers, new Authentication Key or A-Key code, and a Preferred Roaming List or PRL.
However, to prevent the phone being accidentally disabled or removed from the network, the Service Provider
typically locks this data with a Master Subsidiary Lock (MSL). The MSL also locks the device to a particular
carrier when it is sold as a loss leader.

The MSL applies only to the SIM, so once the contract has expired, the MSL still applies to the SIM. The
phone, however, is also initially locked by the manufacturer into the Service Provider's MSL. This lock may be
disabled so that the phone can use other Service Providers' SIM cards. Most phones purchased outside the
U.S. are unlocked phones because there are numerous Service Providers that are close to one another or
have overlapping coverage. The cost to unlock a phone varies but is usually very cheap and is sometimes
provided by independent phone vendors.

A similar module called a Removable User Identity Module or RUIM card is present in some CDMA networks,
notably in China and Indonesia.
Multi-card hybrid phones

A hybrid mobile phone can take more than one SIM card, even of different types. The SIM and RUIM cards can
be mixed together, and some phones also support three or four SIMs[27][28]

They are popular in India and Indonesia, attributed to lower on-net call rates.

edit]Mobile phones in society
[

The world's largest individual mobile operator by subscribers is China Mobile with over 500 million mobile
phone subscribers.[29] Over 50 mobile operators have over 10 million subscribers each, and over 150 mobile
operators have at least one million subscribers by the end of 2009 (source wireless intelligence).

Competitive forces emerged in the Asia Pacific (excluding Japan) region at Q3 2010 to the detriment of market
leader Nokia. Brands such as Micromax, Nexian, and i-Mobile chipped away at Nokia's market share plus
Android powered smartphones also gained momentum across the region at the cost of Nokia.

Based on IDC India, Nokia's market share dropped significantly to 36 percent in the second quarter, from 56.8
percent in the same quarter last year and further drop to 31.5 percent in the third quarter, reflecting the growing
share of Chinese and Indian vendors of low-end mobile phones.[30]

Based on IDC in the last quarter of 2010, RIM has been knocked out from the top five list global mobile phone
sellers. The number one rank is still Nokia followed by Samsung, LG Electronics, ZTE and Apple. For the first
time Chinese ZTE is among the top five list and mainly make of lower cost phones.[31]

For the year of 2010, Sony Ericsson and Motorola are out from the top of five list and have been replaced by
LG Electronics and Apple. Significant increase from 16.5 percent to 30.6 percent has been done by many small
not yet recognized brands (some of them are new brands) - Others-2. Total sales in 2010 to end users were
1.6 billion units or increase by 31.8 percent from the year of 2009.[32]

[edit]Media

In 1998, one of the first examples of selling media content through the mobile phone was the sale
of ringtones by Radiolinja in Finland. Soon afterwards, other media content appeared such as news,
videogames, jokes, horoscopes, TV content and advertising. 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.

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.[35]
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.[original research?]

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).[weasel words] It is also called the Seventh of the Mass
Media (with Print, Recordings, Cinema, Radio, TV and Internet the first six).

[edit]Privacy

Main article: Mobile phone tracking

The movements of a mobile phone user can be tracked by their service provider and, if desired, by law
enforcement agencies and their government. Both the SIM card and the handset can be tracked.[36] China has
proposed using this technology to track commuting patterns ofBeijing city residents.[37]

edit]Usage
[

[edit]Examples

Mobile phones are used for a variety of purposes, including keeping in touch with family members, conducting
business, and having access to a telephone in the event of an emergency. Some people carry more than one
cell phone for different purposes, such as for business and personal use. Multiple SIM cards may also be used
to take advantage of the benefits of different calling plans—a particular plan might provide cheaper local calls,
long-distance calls, international calls, or roaming. A study by Motorola found that one in ten cell phone
subscribers have a second phone that often is kept secret from other family members. These phones may be
used to engage in activities including extramarital affairs or clandestine business dealings. [38] The mobile phone
has also been used in a variety of diverse contexts in society, for example:


                                  Organizations that aid victims of domestic violence may offer a cell phone to
                                   potential victims without the abuser's knowledge. These devices are often old
                                   phones that are donated and refurbished to meet the victim's emergency
                                   needs.[39]

                                  Child predators have taken advantage of cell phones to communicate secretly
                                   with children without the knowledge of their parents or teachers.[40]

                                  The advent of widespread text messaging has resulted in the cell phone
                                   novel; the first literary genre to emerge from the cellular age viatext
                                   messaging to a website that collects the novels as a whole.[41] Paul Levinson,
                                   in Information on the Move (2004), says "...nowadays, a writer can write just
                    about as easily, anywhere, as a reader can read" and they are "not only
                    personal but portable."

                   Mobile telephony also facilitates activism and public journalism being explored
                    by Reuters and Yahoo! [42] and small independent news companies such
                    as Jasmine News in Sri Lanka.

                   Mobile phones help lift poor out of poverty. The United Nations has reported
                    that mobile phones—spreading faster than any other information technology—
                    can improve the livelihood of the poorest people in developing countries. The
                    economic benefits of mobile phones go well beyond access to information
                    where a landline or Internet is not yet available in rural areas, mostly in Least
                    Developed Countries. Mobile phones have spawned a wealth of micro-
                    enterprises, offering work to people with little education and few resources,
                    such as selling airtime on the streets and repairing or refurbishing handsets.[43]

                   In Mali and some African countries, villagers sometimes had to go from village
                    to village all day, covering up to 20 villages, to let friends and relatives know
                    about a wedding, a birth or a death, but such travel is no longer necessary if
                    the villages are within the coverage area of a mobile phone network. Like in
                    many African countries, the coverage is better than that of landline networks,
                    and most people own a mobile phone. However, small villages have no
                    electricity, leaving mobile phone owners to have to recharge their phone
                    batteries using asolar panel or motorcycle battery.[44]

                   The TV industry has recently started using mobile phones to drive live TV
                    viewing through mobile apps, advertising, social tv, and mobile TV.[45] 86% of
                    Americans use their mobile phone while watching TV.

                   In March 2011, a pilot project experimenting with branchless banking was
                    launched by the International Finance Corporation, a member of the World
                    Bank, and Bank Harapan Bali, a subsidiary of Bank Mandiri—the biggest bank
                    in Indonesia and one of the cellular operators inBali. Its aim is to increase the
                    amount of bank customers. In Indonesia, only 60 million people have a bank
                    account even though banks have existed for more than a hundred years,
                    whereas 114 million people have become users of mobile phones in only two
                    decades. Branchless banking has been successful in Kenya, South
                    Africa and Philippines.[46]
[edit]Sharing
In some parts of the world, mobile phone sharing is common. It is prevalent in urban India, as families and
groups of friends often share one or more mobiles among their members. There are obvious economic
benefits, but often familial customs and traditional gender roles play a part.[47] For example, in Burkina Faso, it
is not uncommon for a village to have access to only one mobile phone. The phone is typically owned by a
person who is not natively from the village, such as a teacher or missionary, but it is expected that other
members of the village are allowed to use the cell phone to make necessary calls. [48]

edit]Restrictions
[

[edit]While     driving
Main article: Mobile phones and driving safety

Mobile phone use while driving is common but controversial. Being distracted while operating a motor vehicle
has been shown to increase the risk of accident. Because of this, many jurisdictions prohibit the use of mobile
phones while driving. Egypt, Israel, Japan, Portugal and Singapore ban both handheld and hands-free use of a
mobile phone whilst many other countries—including the UK, France, and many U.S. states—ban handheld
phone use only, allowing hands-free use.

Due to the increasing complexity of mobile phones, they are often more like mobile computers in their available
uses. This has introduced additional difficulties for law enforcement officials in distinguishing one usage from
another as drivers use their devices. This is more apparent in those countries which ban both handheld and
hands-free usage, rather those who have banned handheld use only, as officials cannot easily tell which
function of the mobile phone is being used simply by visually looking at the driver. This can lead to drivers
being stopped for using their device illegally on a phone call when, in fact, they were using the device for a
legal purpose such as the phone's incorporated controls for car stereo or satnav.

A recently published study has reviewed the incidence of mobile phone use while cycling and its effects on
behaviour and safety.[49]

[edit]In   schools
Some schools limit or restrict the use of mobile phones. Schools set restrictions on the use of mobile phones
because of the use of cell phones for cheating on tests, harassment and bullying, causing threats to the
schools security, distractions to the students, and facilitating gossip and other social activity in school. Many
mobile phones are banned in school locker room facilities, public restrooms and swimming pools due to the
built-in cameras that most phones now feature.

[edit]Privacy

Mobile phones have numerous privacy issues.
Governments, law enforcement and intelligence services use mobiles to perform surveillance in the UK and
the U.S. They possess technology to activate the microphones in cell phones remotely in order to listen to
conversations that take place near to the person who holds the phone.[50][51]

Mobile phones are also commonly used to collect location data. While the phone is turned on, the geographical
location of a mobile phone can be determined easily (whether it is being used or not), using a technique
known multilateration to calculate the differences in time for a signal to travel from the cell phone to each of
several cell towers near the owner of the phone.[52][53]

Health effects

There exists a community that believes mobile phone use represents a long-term health risk, although this is
currently disputed by the World Health Organization, with forthcoming mobile phone usage recommendations
in 2010.[54] Certain countries, including France, have warned against the use of cell phones especially by
minors due to health risk uncertainties.[55] Groups of scientists, such as the U.S.-based groupBioinitiative, argue
that because mobile phone use is recently introduced technology, long-term "proof" has been impossible and
that use should be restricted, or monitored closely, while the technology is still new.

The effect mobile phone radiation has on human health is the subject of recent interest and study, as a result of
the enormous increase in mobile phone usage throughout the world (as of June 2009, there were more than
4.3 billion users worldwide[56]). Mobile phones useelectromagnetic radiation in the microwave range, which
some believe may be harmful to human health. A large body of research exists, bothepidemiological and
experimental, in non-human animals and in humans, of which the majority shows no definite causative
relationship between exposure to mobile phones and harmful biological effects in humans. This is often
paraphrased simply as the balance of evidence showing no harm to humans from mobile phones, although a
significant number of individual studies do suggest such a relationship, or are inconclusive. Other digital
wireless systems, such as data communication networks, produce similar radiation.

The World Health Organization, based upon the majority view of scientific and medical communities, has stated
that cancer is unlikely to be caused by cellular phones or their base stations and that reviews have found no
convincing evidence for other health effects.[54][57] The WHO expects to make recommendations about mobile
phones in 2010.[58] Some national radiation advisory authorities[59] have recommended measures to minimize
exposure to their citizens as a precautionary approach.

At least some recent studies, however, have found an association between cell phone use and certain kinds of
brain and salivary gland tumors. Lennart Hardell and other authors of a 2009 meta-analysis of 11 studies from
peer-reviewed journals concluded that cell phone usage for at least ten years “approximately doubles the risk
of being diagnosed with a brain tumor on the same ("ipsilateral") side of the head as that preferred for cell
phone use.”[60]
Future evolution: Broadband Fourth generation (4G)

Main article: 4G

The recently released 4th generation, also known as Beyond 3G, aims to provide broadband wireless
access with nominal data rates of 100 Mbit/s to fast moving devices, and 1 Gbit/s to stationary devices defined
by the ITU-R[61] 4G systems may be based on the 3GPP LTE (Long Term Evolution) cellular standard, offering
peak bit rates of 326.4 Mbit/s. It may perhaps also be based on WiMax or Flash-OFDMwireless metropolitan
area network technologies that promise broadband wireless access with speeds that reaches 233 Mbit/s for
mobile users. The radio interface in these systems is based on all-IP packet switching, MIMO diversity, multi-
carrier modulation schemes, Dynamic Channel Assignment (DCA) and channel-dependent scheduling. A 4G
system should be a complete replacement for current network infrastructure and is expected to be able to
provide a comprehensive and secure IP solution where voice, data, and streamed multimedia can be given to
users on a "Anytime, Anywhere" basis, and at much higher data rates than previous generations. Sprint in the
US has claimed its WiMax network to be "4G network" which most cellular telecoms standardization experts
dispute repeatedly around the world. Sprint's 4G is seen as a marketing gimmick as WiMax itself is part of the
3G air interface. The officially accepted, ITU ratified standards-based 4G networks are not expected to be
commercially launched until 2011. In March 2011, KT (telecommunication company) from South
Korea announced that they has expanded its high-speed wireless broadband network by 4G WiBro cover 85
percent of the population. It is the largest broadband network covered in the world, followed
by Japan and U.S. with 70 percent and 36 percent respectively.[62] At the beginning of 2011, some major mobile
phone companies have released their 4G mobile phones such as from Motorola, HTC and Samsung. [63]

				
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