Some users are reporting issues with FaceTime app and MMS after jailbreaking their iPhone with JailbreakMe 2.0 aka Star. Issues are particularly reported on iPhone 4. The bug was instantly reported to Comex and the good news is that it has been fixed. There won't be any issues if you jailbreak your iPhone with the fresh version of JailbreakMe 2.0. For those who already jailbreaked their iPhone and facing issues, they can try followings remedies.
1. Open Cydia and let the update process complete. If you are prompted about update options, select "complete update".
2. Reset you network settings. To reset settings, simply go to Settings –> General –> Reset –> Reset Network Settings.
3. Reboot your iPhone.
Restore your iPhone
Hopefully, there won't be any issues left after trying these remedies.
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