GSM规范详解 详细介绍了手机GSM 规约 和通信协议-Detailed specification details the GSM mobile phone GSM protocols and communication protocols

详细的GSM通信协议，以及AT指令说明，对于短信猫开发很有帮助。-Detailed GSM communication protocols, as well as descr iption of AT commands for SMS cat development helpful.