Help with SIM NOT VALID after restore...
So i wasnt sure if this phone was unlocked or not at first, but when i got it i went ahead and restored it to 5.1.1 and afterwards i keep getting this "SIM Not Valid" Only compatible SIM cards from a supported carrier may be used to activate iPhone.. i am assuming this phone was unlocked before. is there a trick or any way to get this phone to work again?
When i access the setting it says Carrier Not available
Its an At&t Iphone 4 black