My wife has an AT&T iPhone 4 with Straight Talk service. The phone isn't jailbroken or anything. She's running iOS 6.01. Every time she reboots the phone we go through a lot of hassle trying to get the service to work again. It tells her to dial 112, put the phone in airplane mode etc but it never seems to work until about the 20th try. Is there anything we can do to get this to work without all the troubles? Would unlocking the SIM or jailbraking the phone help at all?