Advantages and disadvantages of mobile phones

Nowadays, mobile phones are becomeing more and more popular among students. At least, every student has a mobile phone at least.However,what are there are the advantages and disadvantages of having mobile phones.
First,there is no doubt that mobile phones can give us convenience are convinient. We can surf the web in our leisure time through mobile phones. If we have finding difficult problems, we can search on the mobile phones. Parents can are able to keep in touch with us easily. But as the saying goes,"one coin has two sides". There are also problems with mobile phones for example, some problems on them some students chat on line or play games in the class. Worse still, To make matters worse, they also use mobile phones while teachers are talking and sometimes the mobile phone will burst out ringing. The behavior is not respectful for towards teachers and classmates. Besides, playing the mobile phone for a long time leads to many teenagers having a poor sight. They will have to wear glasses although even if they are too young.
In my opinion,the advantages of the mobile phones outweigh the disadvantages of their use. Of course the mobile phone is of much use, we can use it only not not just to disturb others..What's more,we but What is more important is using it for a reasonable time to protect our eyes.