Nowadays，mobile phones are very popular. They are playing an important role in our life. We can use them to read news，send messages，make phone calls and read all kinds of books. Besides，we can use them to enjoy music，do some shopping and play games. In a word，mobile phones have made our life more colorful.
However，they also bring us many problems. For example，if people use them while riding，they may have traffic accidents. If we spend a lot of time on the mobile phones，it may affect our study. What's more，they're bad for our eyes and necks.
In my opinion，we shouldn't spend lots of time on them and we should use them properly.