用于彩信的操作AT指令，较为详细的描述了怎么用彩信猫通过AT指令发送彩信。-Used for the operation of the MMS AT instruction, relatively detailed describes how to use multimedia message cat through the AT command sending MMS.

sim300开发文档，主要包括电话接听和拨打、中英文短信的发送与读取、彩信的发送与读取等。-sim300 development documents, including telephone answering and call, send and read English SMS, MMS send and read.

M20彩信串口调试使用的说明 书，可以通过专用串口软件实现彩信发送-M20 MMS serial debugging instructions, can be achieved through a dedicated serial port software sent by MMS