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how do cell phones work


Mobile phone - Wikipedia, the free encyclopedia

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** Mobile phone **

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"Cell Phone" redirects here. For the film, see Cell Phone (film). For the
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The Qualcomm QCP-2700, a mid-1990s candybar style phone, and an iPhone 5, a
current production smartphone.

A *mobile phone* (also known as a *cellular phone*, *cell phone*, and a
*hand phone*) is a device that can make and receive telephone calls over a
radio link while moving around a wide geographic area. It does so by
connecting to a cellular network provided by a mobile phone operator,
allowing access to the public telephone network. By contrast, a cordless
telephone is used only within the short range of a single, private base
station.

In addition to telephony, modern mobile phones also support a wide variety
of other services such as text messaging, MMS, email, Internet access,
short-range wireless communications (infrared, Bluetooth), business
applications, gaming and photography. Mobile phones that offer these and
more general computing capabilities are referred to as smartphones.

The first hand-held mobile phone was demonstrated by John F.
Mitchell^[1]^[2]^[3] and Dr Martin Cooper of Motorola in 1973, using a
handset weighing around 2.2 pounds (1 kg).^[4] In 1983, the DynaTAC 8000x
was the first to be commercially available. From 1990 to 2011, worldwide
mobile phone subscriptions grew from 12.4 million to over 6 billion,
penetrating about 87% of the global population and reaching the bottom of
the economic pyramid.^[5]^[6]^[7]^[8]

*Contents*

· 1 History
· 2 Features

· 2.1 Text messaging
· 2.2 SIM card
· 2.3 Multi-card hybrid phones
· 2.4 Kosher phones

· 3 Mobile phone operators
· 4 Manufacturers
· 5 Use of mobile phones

· 5.1


Source: en.wikipedia.org/wiki/Mobile_phone

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