hello , I want to Know the all procedure of Unlocking AT&T iphone 4 to use when the deal is out of contract. several questions need to ask   1. How do we know that AT&T had just unlocked our device after we asked them to do 2. do we really need AT&T sim card when connecting to itunes. 3.My iphone is still on the activation mode as it is on the time of new purchase, to activate, it  is asking for valid sim though i tried several indian networks but the epic...