I have the same problem, had my iphone 5 on at&t, factory unlocked and upgrade to 6.1.3, now can't use with any carrier, all i see it's No Service... tried everything already..
I have the same problem, had my iphone 5 on at&t, factory unlocked and upgrade to 6.1.3, now can't use with any carrier, all i see it's No Service... tried everything already..