Before the inventions of mobiles humans communicated through letters .Cell phones have vastly changed the way we communicate today. A cell phone can be all you need for communicating. From a cell phone you can make calls, text message, BBM message, email, send and receive directions, go on the Internet, buy things, do online banking, listen to music and much more. In that one device you can do everything. There is no longer a need for multiple devices and you can be on the move doing it all.