GTM900C华为GTM900B模块的替代产品。-Huawei GTM900C alternative GTM900B module.

华为的AT命令手册，一份华为的内部资料，对GSM的操作很有用。-HuaWei AT command manufacture

华为GTM900 EM310等AT指令测试，支持标准AT命令，支持GPRS网络通讯-Supports the standard AT commands to support the GPRS network communications, the Huawei GTM900 EM310, and other AT command test