You may find it easy and fun to use mobile phones. But for many old people, it's a hard thing. Liu Siyuan, a middle school student from Beijing, noticed the problem(问题). He tried to teach the elderly how to use mobile phones with a guidebook.

Liu and six other students spent about half a year writing a book called May I Show You How to Use Mobile Phones. Before writing the book, they made a survey(调查)of more than 1,000 old people. They have found out what problems many old people have with their mobile phones. "How to use WeChat(微信)" was on the top of the list. So it became one part of the book. The other nine parts include(包括) online shopping, using online maps and so on.

Now, they have printed out 500 copies(份) using their own(自己的) money. They gave all the copies to the elderly. They'll soon start to work on the second book. They hope it will teach the elderly something like hospital registration(挂号) and photo editing(编辑).