Mobile phones have become more and more popular in China these days. Wherever you go, you can see people using mobile phones. Many high school students, even primary school students, have mobile phones.
Mobile phones have brought people a lot of benefits, but the most important is that they are convenient. With mobile phones, they can keep in touch with anybody they want. If they want to get some information from the Internet, they can easily have their dream realized through mobile phones too. Furthermore, if someone has a heart attack or a traffic accident, an emergency call to hospital or to the police can quickly bring him help he wants.
However, mobile phones can also bring people problems. The most serious is the electric wave radiation which is thought to be harmful to users' brains. Another problem is that when people are having a meeting or a class, the ring of the mobile phone may interrupt others. So I think people should use mobile phones as little as possible and turn them off when they are attending an important meeting or a class.