The PUK code is supplied with the documentation that came with the AT&T SIM card. If you enter the wrong PUK code more than 3 times the SIM card will be locked out and you will need to purchase a new SIM card.
If you have lost the PUK code only AT&T can give you the correct PUK code. Sorry there is no way around this problem, I'm afraid you have no choice but to contact AT&T.
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