Coverage and Conference Call in Mobiles

If we have a mobile phone we use a network. Networks provide us a service by that we make a call. All networks service is accessible within its network area. Networks area is bounded by geographic area. So, A network give a service in its geographic area called coverage area of call. Out of coverage area we can not make a single call.

Like this conference calls are also provide by mobile phones. Almost all mobile phones have conference calls features. By this we can make call on many people at a time. It connect many people simultaneously and help them discuss on a single line.