Carrying around a cell phone has become second nature to a whole generation of young adults. The technology of a cell phone has advanced in leaps and bounds over the past few years. It seems life has gotten more simple yet often times, busier. A mobile phone can be regarded as a very high-tech radio based device. It's basic structure resembles that of a walkie-talkie and a CB radio. The thing to remember about the differences between a CM and walkie-talkies is that they only have a single channel or a single conversation occurring at one time. Where as a cell phone can use multiple digital channels at once. A mobile phone is a dual mode device in that a user and talk and listen simultaneously. Cell phone working is based frequency system in which one frequency is used for talking while another frequency is used for listening. You can communicate on 1664 channels in a mobile phone but in CB radio only 40 channels are used. The technical term for the things we all carry around these days is cellular phone. Its working protocol is based on division of an area. The whole network area of the provider is divided into small cells or areas. In this network each cell or area has an antenna. Cell phone networks have distributed broadcasting and listening towers all over the place. As cell phones enter a service area, they ping a local tower and initiate message transfer in that location of the network. Thus it is truly known as a cellular phone. A cell phone retrieves its unique code from its service provider. This code distinguishes the cell phone from others and helps in identification. There are quite a complex set of events that unfolds every time you boot up your cell phone. Whenever you switch on the cell phone it seeks for a system identification code to identify uniquely the provider on the control channel. This control channel can be a special frequency, which is used for the purpose of talking. Whenever the phone can't find any control frequency it sends out a no service message. Cell phones all run on different frequencies. The vast majority dial up the proper frequency then match a particular signal to your SIM card to allow the phone to work. Then the GPS system and all of it's related programs can track down your phone, locate it's exactly location, and let's you know where your phone is located. After receiving a call this office searches into the database to locate your phone and identifies the cell you are using.
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