The most basic use of a mobile phone is communication. The phone enables you to communicate with people much faster than you would if you were using snail mail. It also enables you to capture memorable moments for posterity using the camera. See www.rediff.com/money/2005/mar/24guest1.htm for details.
in this present era where every thing is moving at top speed, communication is to made at appropriate time to achieve good result-you are required to carry your cell for this purpose and caanot depend on land line connection-more so if are not confined to your house and this is the minimum usage apart from various applications