这是一个应用于电信计费系统的比较简单的电信计费程序，可实现分区，本地电话，手机电话，长途电话，免费电话的计费功能-This is a system used in telecommunications billing telecommunications billing relatively simple procedure, can achieve district, local telephone, mobile phone, long distance telephone, toll-fr

手机收发短信的程序，代码功能齐全，详细描述了整个过程，包含基本的AT命令-send and receive of message from mobile phone

阅读at命令，帮助你了解如何编写网路短信彩信程序，比如各类手机代码的编写。-Reading at command, to help you learn how to prepare the network SMS MMS procedures, such as the preparation of various types of mobile code.

关于一个手机的指南针程序,-about a program for Compass