How to get MMS settings to work on my jailbroke straighttalk iphone 3gs?

I bought a iphone 3gs originally on at&t's network, it has been jail broke and Safari does work with out an Wi-Fi connection. I have jail broken my iPhone using Cydia and tried to fix the mms setting by installing tether me. But nothing seems to work. Has anyone else had this problem and how did you fix it? I have tried 2 or 3 other ways using youtube videos and they still didn't work.

Reinstall your system jail-breaking now is illegal

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