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PUK Code. The Personal Unblocking Code (PUK code) is a security feature to protect the SIM card user in case of phone theft. When an unknown user attempts to unlock your phone by putting the wrong PIN code three consecutive times, the card will get blocked.
PUK, which is sometimes called the PUK Code, stands for Pin Unlock Code.. It is occasionally called PUC, which is the same as PUK.. This special code is needed to unlock the cell phone if the wrong four-digit pin number has been entered three times in a row or if the SIM Card has been reported stolen.