Ans. A cell phone is type of radio having two way communication. Cell phone network system consists of cells and Base Station (BSs) and Mobile Switching Centre (MSC).
A base station is a wireless communication station set up at a particular geographical location. The geographical area covered by a single base station >s known as a cell. The group of cells forms a cluster. All BSs within a cluster are connected to a MSC by using land lines. The MSC stores information about the subscribes located within the cluster and is responsible for directing calls to them When a caller calls another cell phone, sound waves of caller are converted into radiowaves signal. This radio signal of particular frequency is sent to the local base station of the caller where the signal is assigned a specific radio frequency This signal is then sent to the base station of the receiver through MSC. Then the call is transferred to the cell phone of the receiver. Mobile receiver again changes the radiowaves into sound.