What do you mean by pin and PUK? What do they mean?

PIN refers to the user's personal identification number, which is a series of numbers that authenticate the user's identity and authorize him to enter the system. Usually used in ATM cards and credit card systems.

PUK is actually a PIN unlocking code, and its main function is to unlock the code of the mobile phone when the SIM card enters the wrong PIN code and the mobile phone is locked.

As long as the wrong PIN code is entered three times in a row, the mobile phone will be temporarily locked and cannot be used. At this time, you only need to contact the system operator to which the mobile phone number belongs as soon as possible. After passing the authentication procedure of identity check, the other party will give you a set of PUK codes, and you can unlock them as long as you follow the instructions.

Extended data

The original password for setting a PIN for an enterprise is 1234 or 0000. If the boot PIN code is enabled, you must enter a 4-digit PIN code after each boot, and the PIN code can be modified by the mobile phone. It should be noted that if you enter the wrong PIN code three times in a row, the phone will automatically lock the card and prompt you to enter the PUK code to unlock it. Therefore, you must remember to modify your PIN code.

PUK consists of 8 digits, which cannot be changed by users. When the PIN code of the mobile phone is locked and you are prompted to enter the PUK code, don't act rashly, because the PUK code is only entered 10 times. If you enter 10 times incorrectly, the mobile phone card will be permanently locked. The PUK code of some mobile phone cards is attached to the card when the user buys it, and the other part needs to be asked by the network operator.

Baidu encyclopedia -PUK code

Baidu encyclopedia-product