A technology that allows transmission of data via a computer, without having to be connected to a fixed physical link. Mobile voice communication is widely spread throughout the world. And also it has a very rapid number of subscribers for different types of cellular networks. It also defines that a device which permits the flow of transmission of data from one computer to another by never been connected to the physical link. This technology has the ability to send and receive data through cellular network. This is the principle of mobile computing. The rapidly expanding technology of cellular communication, wireless LANs, and satellite services will make information accessible anywhere and at any time .It is human-computer interaction, by which human can communicate with computer. It allows normal usage like it allows for transmission of data, voice and video. In the near future, millions of people will carry a laptop computer. Now a days, most of the people also use this technologies. Some personal digital assistants, or personal communicators will run on AA batteries and it may have only a small memory; whereas larger ones and powerful will be a laptop computers with large memories and powerful processors. Mobility and portability will create an entire new class of applications and possibly new massive markets combining personal computer and consumer electronics. Mobile data communication has become very important and rapidly evolving technology .As it allows users to transmit and receive data from remote locations to other remote locations or fixed locations. This proves to be the biggest solution to the biggest problem of business people on the move or mobility.