AT指令，用于GSM通信模块，可以发短信，打电话，接电话，上网等，我们的手机差不多也是用这个。-AT commands for GSM communication module, you can send text messages, phone calls, phone, Internet, etc., we also used the phone about this.

pic单片机控制通信模块TC35打电话的程序，请自己输入电话号码-pic controls TC35 to call through uart

PIC16f877单片机控制华为323通信模块，发送短信，打电话-PIC16f877 control mc323 to call and send message