there's no denying the fact that cell phones play an important role in people's life. In my opinion, mobile phone closes the relationship between people, for they contact with each other by phone besides, mobile phone has a lot of functions such as take pictures , listen to music ,send files and so on.
but every coin has two sides. students’ main purpose in school is to study , we should pay all attention to study, not the games on phones. And others would be disturbed if cellphone rings during the class time.