HT4972 my phone has locked  after updating , what should i do now to unlock ? now i don't live in  usa ,i live in Bangladesh and i don't have that sim that i used to . i want to use Bangladeshi sim .

my phone has locked  after updating , what should i do now to unlock ? now i don't live in  usa ,i live in Bangladesh and i don't have that sim that i used to . i want to use Bangladeshi sim .

The phone was hacked to unlock it. It relocked when you updated. ONLY the carrier it is locked to can authorize unlocking it. If you are not/never were an AT&T customer and you do not have an original store receipt from either an AT&T or Apple store in the U.S. for a no commitment AT&T iPhone, they will NOT unlock it.
Buy a new phone.

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