jailbreak后mms和facetime都有问题，试试下面的方法解决
Quote:
There's an unofficial fix if you're missing facetime and MMS that worked for
me:
-add http://iphonedelivery.advinux.fr/cydia as a source
-download the only app from that source
-respring/reboot
-facetime and MMS should now be back
I've also read that if you restore to a pre-jailbreak backup, it will also
give back MMS and facetime without undoing the jailbreak as it's not a full
firmware restore.
