I have an iphone4 from usa and its locked i want to unlock it to use my sim

i have iphone4 turbo sim from america i make update to the phone and it locked i want to unlock the iphone to use my sim .

As stated ONLY the carrier can unlock it. AT&T now offers unlocking, however, from everything that's available so far, you must be an AT&T customer and have either completed your contract, paid the early termination fee, or purchased a no-commitment phone. If you are not an AT&T customer, it's unlikely they will unlock it for you.

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