Assuming you backed up your iPhone 4 before jailbreaking it with JailbreakMe, all you need to do is connect it to your computer, load iTunes, right click on the iPhone and ‘Restore From Backup…’ . Of course 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.
[via ModMyi]