I own an iphone 4 that used to have a sim card under my name with att, then i canceled and used the iphone for a while with gophone prepaid service... I just gave my iphone 4 to my wife, she got a sim card from att with it under her name (new number, new contract)... I placed her new micro sim on my iphone 4 and everything works except data (internet)... My question is: How can she activate data? (she does have the 2giga data plan included) this is a new sim, new number... Does she have to update or restore phone and set it up as a new device? Or is there another way that wont erase the contacts, pictures and song playlist?