please help me .,, its urgent .,,
someone has gifted me an iphone 4 from US . it has been unlocked online by AT&T but it still not working .,, it still shows the error of invalid sim or sim not working .,,,??
iPhone 4, iOS 7.0.6
If AT&T unlocked then they would have sent instrcutions on how to compete the unlock, whcih includes restoring the iphone as new.
Have you or the prior owner followed these directions?