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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 code refers to âPersonal Unlocking Keyâ . PUK code is security code that protects your SIM card data. Your mobile phone asks for PUK code only when you have entered incorrect pin number three times. Once if your mobile starts asking for its PUK code then you can neither make a call nor send text from it.