写作题目：
依照上述图标及如下大纲写一篇以手机为主题的文章，字数不少于120字。
写作大纲：
1. 描述柱形图表示的手机用户数的变化情况
2. 分析原因
3. 评价其现象
参考文章：
Cell Phones
As is shown in the chart, cell phones are becoming increasingly popular within China. In 1999, the number of cell phones in use was only 2 million, but in 2002, the number reaches 5 million. And in the year 2005, the number has suddenly soared to 9 million.
There are many factors contributing to this development. Firstly, a cell phone has no wires and can be carried everywhere easily. Secondly, a cell phone is something wonderful that we can have fun with news, games, music and chat through sending short messages. Thirdly, the drop in price and the simultaneous improvement in the functions have made it possible for an average person to make use of cell phone.
The wide use of cell phones has make them more and more indispensable in people’s daily life. The many functions of the cell phone have made certain people reluctant to separate themselves from their cell phone.