Mobile phone is an electronic device by which we can communicate with others. We live in the age of science and technology. Mobile phone is one of the wonderful inventions of modern science and technology. This communication system works without any wire. Nowadays, we can not think even for a day without mobile phone. The consumers of mobile phone are increasing day by day. Though people are getting benefits, mobile phone sometimes becomes the cause of health hazards. It causes brain tumours, genetic damage and many other incurable diseases. Using cellular phone is also harmful to the pregnant women. But it is a matter of great regret that most people are not aware of the disadvantages of mobile phone. Besides, some people use mobile for commiting crime. Students kill their valuable time using mobile phone. They talk over mobile phone night long hampering their studies. Even sometimes young girls are harrased and teased through mobile phone. But we can’t deny the usefulness of mobile. Earlier it took us weeks and months to contact our near and dear ones. Now we can contact them with a single press of mobile button. Internet is a great source of knowledge and entertainment. We can easily know what is happening in the remotest corner of the world from different news sites. Facebook and other social negworks also help us a lot to get connected with our near and dear ones. There are many mobile apps which are very helpful for students. Mobile banking has created a new era in our modern life. Sending or receiving money is no more difficult. Besides, it has created a new era for the business world. If mobile phone is used in a controlled way, it will do more benefit to us.