If you need to find your PUK code then this eBook will help you.
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Phones Unlocked by iTechUnlimited Until Now:
If you have a PIN number on your SIM card as an extra security measure, you'll need to type the PIN number in each time you turn on your phone. If you do this wrong 3 times, the SIM card will be locked and you will be unable to use the phone. In this situation, you will need your PUK code to unlock the SIM.