彩信MM7的API文档，描述详尽，内部资料。对开发彩信应用很有帮助。-MMS MM7 the API documentation, described in detail, the internal information. Helpful for the development of MMS applications.

联通MMS开发参考文档, 比较详细, 至少比MM7的API详细-Unicom MMS to develop a reference document, in more detail, at least the API in detail MM7

中国移动MM7 API用户手册,介绍的是java的api。-China Mobile MM7 API user manual, introduction of the java api.