Comex, iPhone Dev Team Member released All device JailBreak JailBreakMe 2.0.After jailbreaking iPhone 4 with JailbreakMe 2.0, FaceTime and MMS stopped working for some users.
If your iPhone is already jailbroken with JailbreakMe 2.0 it should work fine because the issue has been addressed in the Jailbreak as well.However if you have already jailbroken iPhone before the issue was fixed, then follow the steps:
Step 1. Open the Cydia.
Step 2. Go to changes tab and hit refresh.
Step 3. There you’ll find an update available for Base Structure.
Step 4. Install it.
Step 5. Restore the firmware.