Networking of Mobile

A mobile phone is also called cell phone or hand phone which is an electronic device used for communication, text messaging or data transmission. Beside the standard voice function, mobile supports many additional services, functions and accessories. In this mordern generation without using computer now we can use mobile for internet services, gaming, MP3 players, video, photos, etc. Bluetooth, camera, infrared ray are the extra function of mobile phone.
(Cellular Telephone) The first ubiquitous wireless telephone. Originally analog, all new cellular systems are digital, which has enabled the cellphone to turn into a smart phone that has access to the Internet. Digital cellphone systems are also offered in the PCS band, which is radio spectrum that was auctioned off by the U.S. government in the mid-1990s. Introduced in the mid- 1980s, cellphone sales exploded worldwide in the 1990s. By 2008, there were more than three billion in use, and many users have become addicted (nomophobia). A cellphone is also called a "mobile phone" or "mobile", especially outside of the US. In the US, the major cellualr carriers are AT and T (formerl Cingular), Verizon Wirless (formerly Bell Atlantic Mobile), Sprint Nextel (merger of sprint and Nextel), T-Mobile, Alltel and Virgin Mobile USA. The largest cellular company in the world is UK-based Vodafone, which includes Substantial ownership in Verizon Wireless. Geographic areas are divided into a number of slightly overlapping circular "cells", Each cell contains a base station, which is identifiable by its transmitting and receiving antenna located on a tower at the top of a hill or building. The base stations connect to the landline telephone system of the country.
The multiple cells combined with low power transmitters allow the same frequencies to be reused with different conversations in different cells within the same city or locale. The primary digital cellphone technologies are TDMA, CDMA and GSM.