Using a mobile phone may increase the risk of certain types of brain cancer in humans and consumers should consider ways of reducing their exposure, World Health Organisation WHO.L cancer experts said on Tuesday.
A working group of 31 scientists from 14 countries meeting at the WHO's International Agency for Research on Cancer IARC.L said a review of all the available scientific evidence suggested cell phone use should be classified as "possibly carcinogenic".
That classification could prompt the United Nations health body to look again at its guidelines on mobile phones, the IARC scientists said, but more research is needed before a more definitive answer on any link can be given.
The WHO had previously said there was no established evidence for a link between cell phone use and cancer. (Reporting by Kate Kelland, editing by Mark Heinrich)
You know who you are. You leave your phone on during flights, maybe do a little text messaging and otherwise break rules about cell phone use on planes once the doors close for departure.
"This is an absurd rule. I never turn (mine) off. I may text or browse the Web, but I never talk on the phone," one CNN.com reader commented recently.
On the other side of the aisle are passengers who abide by the safety instructions and warnings, worried that cellular signals may indeed interfere with cockpit instruments.
Take those two camps and add passengers who say either way, listening to fellow travelers chatter on the phone would be annoying, and you have a heated debate -- sometimes literally in the airplane aisles.
Huffington Post editor Arianna Huffington's BlackBerry use got her in trouble with a fellow flier this month, and in December a dispute came to blows when a teen wouldn't turn off his phone as his flight taxied for takeoff.
A U.S. ban on airborne use of cell phones has been in place for 20 years because of concerns transmissions would interfere with cellular networks on the ground. While many airlines now offer Wi-Fi access via portable electronic devices from laptops to smartphones, cellular voice and data services on domestic airlines fall under that Federal Communications Commission ban.
The Federal Aviation Administration supports the ban, citing potential interference with aircraft communication and navigation systems. The FAA also advises airlines to make sure passengers turn off almost all portable electronic devices during critical phases of flight, below 10,000 feet. Airlines require electronics be turned off and stowed during takeoff and landing.
But airline passengers who have routinely neglected -- or forgotten -- to turn off their mobile phones without devastating consequences have to wonder, how dangerous can it be?
That turns out to be a tough question to answer, but those who've studied the rules sum it up as better safe than sorry.
The risk is small, "buy why take that risk?" asked David Carson, a Boeing engineer who headed up a committee of aviation and electronics experts years ago to advise the FAA on the safety of Wi-Fi and cellular devices on planes.
He compared breaking the cell phone rules with not wearing a seat belt. "I could probably make a flight without a seat belt on and probably I'd be safe," Carson said.
"It's the same kind of thing as operating a cell phone or not. You're probably going to be OK; probably the airplane is new and isn't going to be bothered by it."
The bottom line, he said, is to listen to the flight attendants. They're the ones who are trained to ensure safe travel on the plane you're on, Carson said.
Technological tension on airplanes seems to be growing with rule-conscious passengers wrestling with whether to rat on their noncompliant neighbors.
"That's the dilemma that I've had. You know, there's a kid sitting next to me and do I make a big deal and alienate him and then have to sit next to him the whole flight? Or should I speak up because I'm saving everyone's life?" wonders Mark Rotenstreich, a lawyer in New York.
Rotenstreich, 49, has reason to be a vigilant flier. In the mid-1990s, he found himself climbing out of an emergency exit onto the wing of a plane that crashed at the end of a LaGuardia Airport runway trying to abort takeoff. No one was killed, and the accident had nothing to do with cellular interference, but seeing fellow fliers on their phones does give Rotenstreich pause.
"It definitely makes me uncomfortable," he said.
The FAA said it does not know of any aviation accidents linked to interference from personal electronic devices.
Without hard evidence on interference one way or another from Carson's advisory committee, organized by RTCA Inc., the FAA heeded its recommendation to let the current regulations stand "in the interest of being conservative about safety," said FAA spokesman Les Dorr.
Voluntary reports to the Aviation Safety Reporting System provide some anecdotal evidence of incidents (PDF) that might be tied to interference. One synopsis reports a B757's fuel gauge "blanked after (takeoff) and became operable prior to (landing)." The crew suspected interference from portable electronic devices, according to the summary.
A study conducted by Carnegie Mellon University researchers in 2003 found no definitive evidence of accidents caused by electronic devices but concluded that using the devices in flight was more dangerous than previously believed.
"The data support a conclusion that continued use of portable (radio frequency)-emitting devices such as cell phones will, in all likelihood, someday cause an accident by interfering with critical cockpit instruments such as GPS receivers," the study's authors wrote in a 2006 article on their findings.
The RTCA committee found ways to test airplanes for interference, and it outlined how to do so to help airlines design and outfit planes that can tolerate cell-phone use.
While cell-phone calls on flights in the U.S. are unlikely in the near future, international passengers already have the option to chat or text using their personal phones.
Many international carriers, from Emirates to British Airways, have tested the technology, received approval from regulators and started offering cellular voice and data service on some routes. Roaming agreements allow fliers to make inflight calls that are billed by their personal cell carriers as international roaming. Charges typically run about $9 a minute.
OnAir, one of the main global providers of inflight cellular connectivity, said given the choice, passengers on planes offering its products prefer cellular service to Wi-Fi. OnAir offers both services.
OnAir CEO Ian Dawkins said he expects U.S. airlines will eventually push to revisit the FCC rule as increased use of cellullar service on international carriers sparks competition.
Not necessarily, said Dave Bijur, director of strategic airline solutions at Aircell, a company that provides GoGo Inflight internet service to many of the biggest U.S. airlines.
"If the passengers started squawking and saying, 'Hey, I really want phone service,' we might be concerned with the rules, but because they're not, because the airlines are not, we're just content right where we are," Bijur said.
And the FCC has no plans to revisit the rule anytime soon, for much the same reason. When the commission announced plans to reconsider the ban in 2004, the public weighed in forcefully.
"It was overwhelming. People do not want to have cell phone access or be subjected to people who have cell phone access on an airplane," said Matt Nodine, chief of staff for the FCC's wireless bureau.
Count flier Rotenstreich among those who don't want to listen to seatmate cell talk.
"I would find it completely annoying because it's nice that a plane is one of those places you can go and not have to listen to someone else's phone conversation," he said.
OnAir and other providers and supporters of inflight cellular voice service say the vision of a cacophony of prattling airline passengers is distorted. Most calls last less than three minutes, according to OnAir, and the onboard infrastructure limits the number of simultaneous calls. Only six to 12 calls can be placed at once.
Carson hears similar accounts from airlines who offer voice service. "You don't get 300 people all yelling on a cell phone," he said.
One of the best comments he's heard on the social side of the debate makes a valid point: "A loud talker doesn't need a cell phone to be annoying."
The HTC EVO Shift 4G is a WiMax-enabled Android smartphone. Although the Shift is the successor to the HTC EVO 4G, it differs in design and size, as the Shift comes with sliding QWERTY keyboard and a smaller display.
Sprint’s CEO Dan Hesse said, “Sprint will continue to set the bar for feature-rich and customer-friendly 4G devices into 2011… Our proven leadership as a 4G pioneer has allowed our customers to enjoy 4G from Sprint first, and these new products exemplify Sprint's commitment to put industry-leading performance and capabilities in the hands of our customers.”
The announcement of a new smartphone from Sprint is a direct challenge to Verizon. Verizon launched its 4G service in December and is the country’s largest wireless carrier, and is expected to introduce four smartphones designed to work on the 4G network. But the move to introduce a cheaper 4G-enabled phone may alter the prospects for Verizon, as the Shift has all the features of other high-end smartphones and competes on price.
The Shift is also equipped with MiFi, which enables the new device to run widgets and Web apps right on the device. It also acts as server for files stored on a MicroSD memory card. The MiFi is priced at $49.99 with a two year contract and will be available on Feb. 27.
Sprint says the Shift allows up to eight Wi-Fi-enabled devices to connect to the 3G/4G wireless network.
Various research papers suggest that even small amount of radio frequency (RF) energy produced by cell phones can cause significant DNA damage.
Revealing the link between the risk of brain cancer and mobile usage, large international study - Interphone - conducted by EU countries, Japan, Canada, New Zealand and UK, that was published in May 2010 in the International Journal of Epidemiology mentioned that excessive use of mobile phones has doubled brain tumour risk.
However, the Interphone researchers have taken an average user as a person who uses cell phone for 2 hours in a month while, in India, many people use cell phones for 1 to 2 hours a day.
Today, large population in India is using cell phones for several hours in a day without realising the severe health hazards, it can create.
A detailed report on Cell Tower Radiation - prepared by IIT Bombay's professor Girish Kumar from electrical engineering department and submitted to department of telecom, Delhi last week - that focuses on the Indian contexts of the cell usage and potential health risks, notes "When electromagnetic radiation (EMR) from a cell phone (Frequency -GSM 900 MHz) hits the head, it penetrates the skull. The radiation penetrates the skull of an adult (25%), 10-year-old (50%) and a 5-year-old (75%)."
It implies that children are more vulnerable to EMR as the energy penetrates more deeply into their smaller heads. A number of adverse health effects of radiation exposure have been documented in the report which include altered white blood cells in children; childhood leukemia, headaches, dizziness, insomnia etc.
Cell phone and Cancer
EMR frequencies can damage DNA and interfere with the natural processes involved in DNA replication and repair. Linking radiation with risk of cancers, the report says, damage to DNA is a central mechanism for developing cancer.
Heavy use of mobile phones can cause cancer. Use of mobile phones formore than 10 years give a consistent pattern of increased risk for brain cancer -glioma (cancer of the glial cells that support the central nervous system) and acoustic neuroma (a tumour in the brain on a nerve related to hearing).
The risk is highest for developing tumour on the same side of the head where the instrument is held. Increased risk of salivary gland cancer is reportedly linked to the use of mobile phones. Recent studies confirm that cell phone radiation can drastically affect male fertility.
"Studies have found 30% sperm decrease in intensive mobile phone users. Similarly, motility of the sperm was also affected by mobile phone transmissions," it says.
The report notes that radiation from cell towers and mobile phones affects skin and may cause electromagnetic hypersensitivity (EHS). People suffering from this condition report a range of symptoms including biting and stinging sensations; or lesions, rashes or sores.
With potential to cause Tinnitus (Ringxiety - the psychological disease of hearing phantom sound), the radiation emitted by mobile phones may damage the delicate workings of the inner ear.
For many marketing professionals, engaging in long talks over mobile phone, the problem starts with a pain in the ear that gradually develops into a ringing sensation which finally leads to hearing loss, notes the report.
Child User
Those, who are using cell phones for more than four years and for more than 30 minutes in a day, are at a higher risk of developing hearing loss, which cannot be reversed.
EMR exposure has been shown to affect the brain physiology and is also shown to be in connection with Alzheimer's and
Parkinson's disease. "Use of the handsets before bed, delays and reduces sleep, and causes headaches, confusion and depression. People living near mobile phone base stations are also at greater risk for developing neuropsychiatric problems as headache, memory loss, dizziness, tremors, muscle spasms, numbness, muscle and joint pain and sleep disturbance,"
The California Supreme Court ruled that phones obtained following an arrest can be searched without a warrant by police. The decision which had a 5 – 2 majority reasoned that phones were personal property and “immediately associated” with the suspect person.
Justice Kathryn Werdegar however wrote that the ruling violates the U.S Constitution’s Fourth Amendment, and subsequently information stored on a cell phone should not be examined without a warrant.
The debate follows an incident where Gregory Diaz was convicted on evidence found in the man’s cell phone which showed messages negotiating the price of drugs. Though his defence tried to suppress the evidence from the phone, both trial and Second District Court of Appeal held that the search was justified.
The Supreme Court used two cases as a guide to reach its decision. United States v. Robinson , 414 U.S. 218, 224 (1973) which held it was legal for the arresting officer to search the arrestees cigarette packet, and United States v. Chadwick 433 U.S. 1, 14-15 (1977), where federal agents were found to be lawful to search a foot locker.
A mobile phone (also called mobile, cell phone or hand phone) is an electronic device used for mobile telecommunications over a cellular network of base stations known as cell sites. Mobile phones differ from cordless telephones, which only offer telephone service within limited range through a single base station attached to a fixed line, for example within a home or an office. Low-end mobile phones are often referred to as feature phones, whereas high-end mobile phones that offer more advanced computing ability are referred to as smart phones.
A mobile phone allows its user to make and receive telephone calls to and from the public telephone network which 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. A key feature of the cellular network is that it enables seamless telephone calls even when the user is moving around wide areas via a process known as handoff or handover.
In addition to being a telephone, modern mobile phones also support many additional services, and accessories, such as SMS (or text) messages, email, Internet access, gaming, Bluetooth, infrared, camera, MMS messaging, MP3 player, radio and GPS.
The first hand held phone was demonstrated by Martin Cooper of Motorola in 1973, using a handset weighing in at two kilos.By the end of 2009, the number of mobile cellular subscriptions worldwide reached approximately 4.6 billion, penetrating the developing economies and reaching the bottom of the economic pyramid.
The Inner Of Mobile Phones:
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 mobile radio devices have been available since 1973.
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.
Martin Cooper, a Motorola researcher and executive is considered to be the inventor of the first practical mobile phone for hand-held 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 hand-held mobile phone on April 3, 1973 to his rival, Dr. Joel S. Engel of Bell Labs.
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 nation-wide 1G network. In 1981, this was followed by the simultaneous launch of the Nordic Mobile Telephone (NMT) system in Denmark, Finland, Norway and Sweden.[7]. 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 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.
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.
Cell phone features and Smartphone
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 twenty years.
The common components found on all phones are:
* a rechargeable battery providing the power source for the phone functions
* an input mechanism and display to allow the user to interact with the phone. The most common input mechanism is a keypad, but touch screens are also found in some high end smart phones.
* basic mobile phone services to allow users to make calls and send text messages.
* All GSM phones use a SIM card to allow an account to be swapped to between devices. Some CDMA devices also have a similar card called a R-UIM.
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 smart phones. The first smartphone was the Nokia 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.
It’s 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 ring tone service. In 1999 Japanese mobile operator NTT DoCoMo introduced its mobile internet service, i-Mode, which today is the world's largest mobile internet service.
The first mobile news service, delivered via SMS, was launched in Finland in 2000. Mobile news services are expanding with many organisations providing "on-demand" news services by SMS. Some also provide "instant" news pushed out by SMS.
Mobile 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.
It’s Power supply
Mobile phones generally obtain power from rechargeable batteries. There are a variety of ways used to charge cell phones, including USB, portable batteries, mains power (using an AC adapter), cigarette lighters (using an adapter), or a dynamo. In 2009, wireless charging became a reality, and the first wireless charger was released for consumer use.
Micro-USB connector for charging
Starting from 2010, many mobile phone manufacturers have agreed to use the Micro-USB connector for charging their phones. The mobile phone manufacturers who have agreed to this standard include:
* LG
* Motorola
* Nokia
* Research In Motion
* Samsung
* Sony Ericsson
On 17 February 2009, the GSM Association announced that they had agreed on a standard charger for mobile phones. The standard connector to be adopted by 17 manufacturers in the Open Mobile Terminal Platform including Nokia, Motorola and Samsung is to be the micro-USB connector (several media reports erroneously reported this as the mini-USB). The new chargers will be much more efficient than existing chargers. Having a standard charger for all phones, means that manufacturers will no longer have to supply a charger with every new phone.
In addition, on 22 October 2009 the International Telecommunication Union (ITU) announced that it had embraced micro-USB as the Universal Charger Solution its "energy-efficient one-charger-fits-all new mobile phone solution", and added: "Based on the Micro-USB interface, UCS chargers will also include a 4-star or higher efficiency rating — up to three times more energy-efficient than an unrated charger."
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 Electronics, 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.
Nickel metal-hydride batteries
Formerly, the most common form of mobile phone batteries were nickel metal-hydride, as they have a low size and weight. lithium ion batteries are sometimes used, as they are lighter and do not have the voltage depression that nickel metal-hydride batteries do. Many mobile phone manufacturers have now switched to using lithium-polymer batteries as opposed to the older Lithium-Ion, the main advantages of this being even lower weight and the possibility to make the battery a shape other than strict cuboids. Mobile phone manufacturers have been experimenting with alternative
SIM card
Main articles: Subscriber Identity Module and Removable User Identity Module
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 and computers). 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, with Munich smart card maker Giesecke & Devrient selling the first 300 SIM cards to Finnish wireless network operator 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 to the SIM only so once the contract has been completed the MSL still applies to the SIM. The phone however, is also initially locked by the manufacturer into the Service Providers MSL. This lock may be disabled so that the phone can use other Service Providers SIM cards. Most phones purchased outside the US are unlocked phones because there are numerous Service Providers in close proximity 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 is present in some CDMA networks, notably in China.
Mobile phones in society through the globe
Global device market share :he world's largest individual mobile operator is China Mobile with over 500 million mobile phone subscribers. The world's largest mobile operator group by subscribers is UK based Vodafone. There are over 600 mobile operators and carriers in commercial production worldwide. 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).
In mobile phone handsets, in Q3/2009, Nokia was the world's largest manufacturer of mobile phones, with a global device market share of 37.8%, followed by Samsung (21.0%), LG Electronics (11.0%), Sony Ericsson (4.9%) and Motorola (4.7%). These manufacturers accounted for over 80% of all mobile phones sold at that time.
Other manufacturers include Apple Inc., Audiovox (now UTStarcom), CECT, HTC Corporation, Fujitsu, Kyocera, Mitsubishi Electric, NEC, Panasonic, Palm, Matsushita, Pantech Wireless Inc., Philips, Qualcomm Inc., Research In Motion Ltd. (RIM), Sagem, Sanyo, Sharp, Sierra Wireless, SK Teletech, T&A Alcatel, Huawei, Trium, Toshiba and Vidalco. There are also specialist communication systems related to (but distinct from) mobile phones.
Mass media
The mobile phone became a mass media channel in 1998 when the first ringtones were sold to mobile phones by Radiolinja in Finland. Soon other media content appeared such as news, videogames, jokes, horoscopes, TV content and advertising. In 2006 the total value of mobile phone paid media content exceeded internet paid media content and was worth 31 Billion dollars (source Informal 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.
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). Most early content for mobile tended to be copies of legacy media, such as the banner advertisement or the TV news highlight video clip. Recently unique content for mobile has been emerging, from the ringing tones and ringback tones in music to "mobisodes," video content that has been produced exclusively for mobile phones.
The advent of media on the mobile phone has also produced the opportunity to identify and track Alpha Users or Hubs, the most influential members of any social community. AMF Ventures measured in 2007 the relative accuracy of three mass media, and found that audience measures on mobile were nine times more accurate than on the internet and 90 times more accurate than on TV.[original research?]
Used for a variety of purposes
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.
Cell phone sharing is a phenomenon which exists around the world. It is prevalent in urban India, as families and groups of friends often share one or more mobiles among their members. Two types of sharing which exist are "conspicuous" and "stealthy" sharing. An example of conspicuous sharing takes place when someone calls the friend of the person they are trying to reach in hopes of being able to talk to that individual; stealthy sharing occurs when an individual uses another's cell phone without their knowledge. Phone sharing does not only take place because of its economic benefits, but also often due to familial customs and traditional gender roles.[20] An example of cell phone sharing occurs in Burkina Faso. There it is not uncommon for a village to only have access to one cell phone. This cell phone is typically owned by a person who is not natively from the village, such as a teacher or missionary. Although the cell phone is the sole property of one individual, it is the expectation that other members of the village are allowed to use the cell phone to make necessary calls. Although some may consider this a burden, it can actually be an opportunity to engage in reciprocal obligations. This type of cell phone sharing is an important for the small villages in Burkina Faso because it allows them to keep up with the expectations of the globalizing world.
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.
* Child predators have taken advantage of cell phones to secretly communicate with children without the knowledge of their parents or teachers.
* The advent of widespread text messaging has resulted in the cell phone novel; the first literary genre to emerge from the cellular age via text messaging to a website that collects the novels as a whole. 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! and small independent news companies such as Jasmine News in Sri Lanka.
Numerous privacy issues
Cell phones have numerous privacy issues associated with them, and are regularly used by governments to perform surveillance.
Law enforcement and intelligence services in the UK and the US possess technology to remotely activate the microphones in cell phones in order to listen to conversations that take place nearby the person who holds the phone.
Mobile phones are also commonly used to collect location data. 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.
Restriction on usage
Mobile phone radiation and health
There exists a community which 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. Certain countries, including France, have warned against the use of cell phones especially by minors due to health risk uncertainties. Groups of scientists, such as the US based group Bioinitiative, 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.
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 hand-held and hands-free use of a mobile phone whilst many other countries –including the UK, France, and many US states– ban hand-held phone use only, allowing hands-free use.
Due to the increasing complexity of mobile phones –often more like mobile computers in their available uses– it has introduced additional difficulties for law enforcement officials in being able to tell one usage from another as drivers use their devices. This is more apparent in those countries who ban both hand-held and hands-free usage, rather those who have banned hand-held 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 mean that drivers may be stopped for using their device illegally on a phone call, when in fact they were not; instead using the device for a legal purpose such as the phones' incorporated controls for car stereo or satang usage – either as part of the cars' own device or directly on the mobile phone itself.
Cases like these can often only be proved otherwise by a check of the mobile operators phone call records to see if a call was taking place during the journey concerned. Although in many countries the law enforcement official may have stopped the driver for a differing offence, for example, for lack of due care and attention in relation to their driving.
Schools set restrictions
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.
A recently published study has reviewed the incidence of mobile phone use while cycling and its effects on behavior and safety.
Broadband Fourth generation (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 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-OFDM wireless 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.
Comparison to similar systems
Car phone :A type of telephone permanently mounted in a vehicle, these often have more powerful transmitters, an external antenna and loudspeaker for hands free use. They usually connect to the same networks as regular mobile phones.
Cordless telephone (portable phone)
Cordless phones are telephones which use one or more radio handsets in place of a wired handset. The handsets connect wirelessly to a base station, which in turn connects to a conventional land line for calling. Unlike mobile phones, cordless phones use private base stations (belonging to the land-line subscriber), which are not shared.
Advanced professional mobile radio systems
Advanced professional mobile radio systems can be very similar to mobile phone systems. Notably, the IDEN standard has been used as both a private trucked 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.
PSTN phone call
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, or they may require the assistance of a human operator to set up a PSTN phone call.
Artificial satellite phone
This type of phone communicates directly with an artificial satellite, which in turn relays calls to a base station or another satellite phone. A single satellite can provide coverage to a much greater area than terrestrial base stations. Since satellite phones are costly, their use is typically limited to people in remote areas where no mobile phone coverage exists, such as mountain climbers, mariners in the open sea, and news reporters at disaster sites.
IP Phone
This type of phone delivers or receives calls over internet, LAN or WAN networks using VoIP as opposed to traditional CDMA and GSM networks. In business, the majority of these IP Phones tend to be connected via wired Ethernet, however wireless varieties do exist. Several vendors have developed standalone WiFi phones. Additionally, some cellular mobile phones include the ability to place VoIP calls over cellular high speed data networks and/or wireless internet.
