A Personal Unblocking Key (PUK) code is a security feature used by SIM cards to protect against unauthorized use. If you enter the wrong PIN code three times in a row, your SIM card will be locked and you will need the PUK code to unlock it.
The PUK code is usually provided by your network operator when you first get your SIM card. It is important to keep the PUK code safe, as you will need it if you ever need to unlock your SIM card.
