Mobile phone is convenient for us to talk with each other.But some students always use it to play games.So some parents don't want their children to use mobile phone.But children don't think so.Mobile phone is useful.We can use it to ask some questions.When we have something wrong.We can use it to ask for help.So i think that mobile phone is useful.大神，可以再加一点手机不好的方面吗？字数不够诶。Somebody likes to listen to music by mobile phone.But it is not good for our health.Somebody often play it at night.So they have not enough time to have rest.