说明：  Android的Radio Interface Layer (RIL)提供了电话服务和的radio硬件之间的抽象层。Radio Interface Layer RIL(Radio Interface Layer)负责数据的可靠传输、AT命令的发送以及response的解析。应用处理器通过AT命令集与带GPRS功能的无线通讯模块通信。AT command由Hayes公司发明，是一个调制解调器制造商采用的一个调制解调器命令语言，每条命令以字母"AT"开头。
(Android' s Radio Interface Layer (RIL) to provide telephone services and the radio hardware abstraction layer between. Radio Interface Layer RIL (Radio Interface Layer) is responsible for reliable transmission of data, AT commands to send, as well as the analytical response. Application processor through the AT command set and functionality with GPRS wireless communication module. AT command invented by the Hayes Company, a manufacturer of modems used in a modem command language, and each order of the letters " AT" at the beginning.)