 　　基本功能

 　　呼入

 　　呼出

 　　编辑、发送、接收和阅读短信

 　　系统组成

 　　手机的基本硬件

 　　键盘（10个号码键、呼叫、挂断、上下左右四个方向键、退格键），显示屏，

麦克风和扬声器

 　　手机的基本操作系统

 　　包含基本硬件系统的控制软件

 　　包含手机和基站系统间的通信接口

 　　手机的应用软件

 　　呼叫处理和短信功能

-basic functions # 61550 # # 61557 61557 inbound exhaled # 61557 edit, send, receive and read messages # 61550 # 61557 system composed of the basic phone hardware keyboard # 61556 (No. 10 keys, call, hang up, from top to bottom about four direction keys and backspace) , screen, microphone and speaker phone # 61557 # 61556 basic operating system contains basic hardware system control software # 61556 includes base stations and mobile communications systems interface to the phone # 61557 # 61556 application software call processing and messaging functions