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