As can be seen from the charts more and more people own mobile phones in China now. At the end of 2002, there were 20 million mobile phone users. By the year 2005 the number has reached up to 30 million. People have found mobile phones very convenient. They can get in touch with each other whenever and wherever they like. There are many different functions to meet different needs, such as sending short messages and surfing the Intemet.

　　However, it may also bring us some trouble. For example, if someone calls you by mistake, you will have to pay for this kind of unnecessary calls. And the radiation from the phone may do harm to our health, In spite of this, the number of people having mobile phones is still increasing steadily.