说明：  用户可以通过AT 命令进行呼叫短信电话本数据业务补充业务传真等方面的控制。该文档是AT指令集（中文）的详细说明。
(Users can make calls through the AT command message phone book data, such as the replenishment of the operational aspects of fax control. The document is AT instruction set (Chinese) a detailed description.)