FaceTime and MMS bugs are now fixed for NEW JailbreakMe users. If you are already jailbroken, here’s what you have to do…
iPhone 4 FaceTime bug
Posted inHOWTO
HOW TO: Possibly Fix iPhone 4’s FaceTime And MMS Bugs After Jailbreaking With JailbreakMe
this is a quick fix that will probably won’t work for everybody. But still , if you really can’t live without MMS and FaceTime for another few hours to a day until JailbreakMe is updated to fix these bugs, won’t hurt you to try.