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The personal identification number (PIN) on your cell phone acts as a security measure to keep unauthorized users from accessing your cell phone. But if you forget your PIN, you'll also be locked out. The pin unlock key (PUK) is a six-digit number that helps you reset your PIN. Most users don’t even realize they have a PUK code until they fail to enter the correct PIN code in their cell phones three times. At that point, the cell phone asks for a PUK code and you must contact your mobile service provider.

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