西门子GPRS模块MC37i的AT指令集，介绍了MC37i的状态控制、拨号、短消息控制等指令-This document provides detailed introduction to the AT commands of the GPRS module MC37i

GSM AT指令，是学习AT指令协议的最好资料，里面综合了所有AT指令资料．-GSM AT instruction, learning AT command protocol best data, which integrates all the AT instruction data.