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You can reset the SIM card, using what's called a personal unlock code, or PUK code, which you can usually obtain from your phone carrier. You can set a SIM PIN code to prevent people from ...

PUK is the code required to unlock a GSM SIM card that has disabled itself after an incorrect PIN code was entered 3-5 times in a row. If an incorrect PUK code is entered a certain number of times ...