This is the source code I have not completed, there is a relatively complete comment, which contains 1. Data transfer section: The specific implementation of the OBEX protocol. Mainly for Siemens M55 mobile phones, other models of mobile phones can be appropriately modified 2, .NET's serial communication. Special thanks to Crs232.vb at this time. 3, AT command module 4, SMS transmit receiving module 5, VCARD read module. A simple decoder basically implements all features that should have on my Blog site, but there may be some bugs and unreasonable places on programming. If you are interested, you can download it. If you use VSS when you are writing, please contact me if you don't open the source. Download Location: http://wwsicong2004.vip.myrice.com In addition, this source code is only available for learning purposes, and I don't be responsible for all losses it possible. You can modify and spread arbitrarily, but please send me a code after the changes. If you need to make a commercial software, please contact me first.