Hi, Hope this help. First you have to Jailbroken it. Second search MMS in cydia. Last, after completing the task and I recall then it only works using wifi. Google it. Good Luck.

Hi, Hope this help. Some data are in itunes backup file mostly contacts. Type 'contacts' for search. For the iphone downgrade to older fw like 3.x just google it. Good Luck.

Hope this help, Check your phone setting for inbound rings.. If none...then call yourself and press or turn up volume button..