| A cell phone is nothing but a radio, but very | | | | you can communicate on 1664 channels.Lets |
| high-tech. It is basically like a CB radio or | | | | clarify why this phone is called cell phone |
| walkie-talkie. But CB radio or walkie-talkie | | | | or cellular phone. The whole network area of |
| is a simplex system, where at a time a person | | | | the provider is divided into small cells or |
| can talk or listen. But a cell phone is a | | | | areas. Each area or cell contains an antenna. |
| duplex device, where a person can listen and | | | | When a person moves within the network area |
| talk at the same time. One frequency is used | | | | carrying a cell phone, the cell phone keeps |
| for talking and another for listening. In CB | | | | contact with the local antenna. |
| radio 40 channels are used. But in cell phone | | | | |