how does a cell phone work?
A cell phone is a special type of phone that is not connected to your telephone in the house and works both inside and away from your house. For example, you can use a cell phone to make and receive calls in your car, at the park, at the mall, or even at the beach. A cell phone turns your voice into a special type of electricity and sends it over the air to a nearby cell tower; the tower sends your voice to the person you are calling. Cell phones work well when they are near cell towers, but not so well if they are too far away from a cell tower. Cell phones are important because they let us keep in touch with our families when we are away from the house, and can be used almost anywhere to make 9-1-1 calls in case of an emergency. Some cell phones have games you can play; some let you send email or send instant messages to your friends; and some let you take pictures and send them to people.
What is a cell phone? The amazing fact about a cell phone is that it is a radio – a very special one. The gurus in the line are Bell (1876), Tesla (1880) followed by Marconi and Bose (late 19th century). It is known that the concept of cell phone was produced by Bell Laboratories with the permission of FCC (Federal Communication Commission), and had everything to do with broadcasting and sending a radio message out over the airwaves. In cell phone technology cells divide the city, allowing for the facility to be frequently reused throughout the city. Millions can simultaneously avail of it. In devices that are half-duplex (walkie-talkies and CB radios) two communicators use a single frequency. This means that at a single point of time only one can talk. On the other hand a cell phone being a full duplex tool has two frequencies: one for talking and the other for listening. Thus a real-life conversation can take place. Cell phones glide through 1,664 channels whereas the walkie-talkie g
