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The development of metal-oxide-semiconductor large-scale integration technology, information theory and cellular networking led to the development of affordable mobile communications, and devices such as the car phone. The first handheld cellular mobile phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a handset weighing 2 kilograms (4.4 lb). The first commercial automated cellular network analog was launched in Japan by Nippon Telegraph and Telephone in 1979. This was followed in 1981 by the simultaneous launch of the Nordic Mobile Telephone system in Denmark, Finland, Norway, and Sweden. Several other countries then followed in the early to mid-1980s. These first-generation systems could support far more simultaneous calls but still used analog cellular technology.

Audio quality can be improved using a VoIP application over WiFi. Cellphones have small speakers so that the user can use a speakerphone feature and talk to a person on the phone without holding it to their ear. The small speakers can also be used to listen to digital audio files of music or speech or watch videos with an audio component, without holding the phone close to the ear.

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Nokia was the market leader in mobile phones from 1998 to 2012. In Q1 2012, Samsung surpassed Nokia, selling 93.5 million units as against Nokia's 82.7 million units. Additionally, short-range Wi-Fi infrastructure is often used by smartphones as much as possible as it offloads traffic from cell networks on to local area networks.

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“Introducing the New McAfee Wireless Home Network Security—Now you can keep your wireless home network and data safe, complementing your antivirus and firewall protection. Wi-Fi networks are a huge convenience, but they can also be open targets for the new wave of “wireless” hackers. Your new PC may be loaded to the hilt with security software, but if your wireless network is not protected, you could still be vulnerable. Lock down your wireless now with the proven security of McAfee” (e-mail communication received from McAfee, September 2005). Have presented an in-depth review on the solutions, including heuristic rules, spatiotemporal clustering, etc. Those algorithms can be used to preprocess mobile phone traces before conducting activity-travel behavior analysis.

In 1983, the DynaTAC 8000x was the first commercially available handheld mobile phone. The effect of mobile phone radiation on human health is the subject of recent[when? ] interest and study, as a result of the enormous increase in mobile phone usage throughout the world. Mobile phones use electromagnetic radiation in the microwave range, which some believe may be harmful to human health. A large body of research exists, both epidemiological and experimental, in non-human animals and in humans.

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Handsets with more advanced computing ability through the use of native software applications are known as smartphones. Research has shown an increased risk of traffic accidents, about 3–4 times greater chance of an accident, when mobile phones (either handheld or with a “hands-free” kit) are used while driving due to distraction. Mobile phones emit radiofrequency energy, a form of non-ionizing electromagnetic radiation, which can be absorbed by tissues close to the phone. Use of mobile phones also spawns a wealth of micro-enterprises, by providing such work as selling airtime on the streets and repairing or refurbishing handsets. The new mobiles and their unique features pique the interest of most tech enthusiasts. Smartphones are now available at almost every price point in Pakistan.

The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which provides access to the public switched telephone network . Modern mobile telephone services use a cellular network architecture and, therefore, mobile telephones are called cellular telephones or cell phones in North America. Mobile phones offering only those capabilities are known as feature phones; mobile phones which offer greatly advanced computing capabilities are referred to as smartphones. Mobile or cell phones are now a days an integral part of modern telecommunications in every individual life. In many countries, over half of the population use mobile phones and the mobile phone market is growing rapidly. Saudi Arabia rank first among the countries of the gulf region with highest proportion of mobile users, a study conducted by United Nations Conference on Trade and Development .

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In the United Kingdom, from 27 February 2007, motorists who are caught using a hand-held mobile phone while driving will have three penalty points added to their license in addition to the fine of £60. This increase was introduced to try to stem the increase in drivers ignoring the law. Japan prohibits all mobile phone use while driving, including use of hands-free devices.

From 2010 onwards, such phones became popular in emerging markets, and this was attributed to the desire to obtain the lowest calling costs. An input mechanism to allow the user to interact with the phone. These are a keypad for feature phones, and touch screens for most smartphones .

The first mobile news service, delivered via SMS, was launched in Finland in 2000, and subsequently many organizations provided "on-demand" and "instant" news services by SMS. Mobile phones communicate with cell towers that are placed to give coverage across a telephone service area, which is divided up into 'cells'. Each cell uses a different set of frequencies from neighboring cells, and will typically be covered by three towers placed at different locations. The cell towers are usually interconnected to each other and the phone network and the internet by wired connections.