What's the use of mobile phone card puk

1. The PUK code of Unicom mobile phone card is the unlocking code (***8 bits long) used to unlock the PIN code. PIN is a password used to protect the security of SIM card. When the PIN code is entered incorrectly for three consecutive times, the SIM card will automatically lock, and you need to enter the PUK code to unlock it.

2. The PUK code of Unicom mobile phone card can be queried in the following ways:

1. Download and log in to China Unicom APP, and click on the menu "My-Settings-Security Center-My PUK Code" to query the PUK code information.

2. The owner himself goes to Unicom's own business hall with a valid certificate to inquire about PUK code information.

3. You * * * have 65,438+00 chances to enter the PUK password. After more than 10 times, the SIM card will automatically start the self-destruction program, making the SIM card invalid. At this time, you have to go to the business hall to reissue the card.

Four, each SIM card corresponds to a PUK code, and the PUK code of the SIM card will change after the card change service.

Warm reminder: The above answer takes Chongqing as an example, and the policies of different provinces may be different. It is recommended to call the customer service hotline of the local operator for detailed consultation.