Mobile means moving. Mobile phone is a phone which can be carried easily from one place to another place. It is very small and easily portable in hands or in pockets. It is used to communicate with others. The businessmen can run their business by communicating with other related to his business through mobile phone. The politicians, professionals, journalists, doctors, administrators, planners, can communication, with the concerned people, exchange views and messages, ideas, through mobile phone sitting at a long distance with minimum cost of money and time. It is used to send and received messages, play games and sports, know the time and date, solve the work of mathematical calculation, get information about business and trade and learn about news, we can easily communicate with our near and dear ones with a twinkle of an eye by means of a mobile phone. We can talk to our relatives with the help of a mobile phone and be free from tension and anxiety. But like other invention of science, mobile phone is not an unmixed blessing. With all the advantages, it has some disadvantages too. It is found that excessive use of mobile may cause cancer or affect our listening ability. It may also help the criminals to commit crimes very secretly. Sometimes terrorists use mobile phone to conduct their acts of terrorism. But with all disadvantages, a mobile phone is very useful and helpful to the people of modern world. Nowadays, no man can think to do without a set mobile phone in his hand or in his pocket.