说明：  手机短信编成的的几个重要文档,包括gsm0338,gsm0340,gsm0707和sm in pdu mode。看完这几个文档，就可以对手机短信编程有个透彻的了解。
(Message into the phone a few important documents, including gsm0338, gsm0340, gsm0707 and sm in pdu mode. After reading these documents, cell phone message can be programmed to have a thorough understanding.)