1, check the back of sim card.
On the back of the sim card, an 8-digit puk code is usually printed. If you still have a sim card, you can check the back directly.
2. Call the operator's customer service phone.
Call the operator's customer service phone, and you can ask the customer service staff for the puk code. It should be noted that when calling customer service, you need to provide your own identity information, including name, ID number and mobile phone number.
3. Log in to the operator official website.
If you have opened the online business hall of the operator, you can log in to official website to check the puk code. Usually, the operator official website will provide puk code query function.
Function of puk code
PUK code (personal authentication number unlocking key) is a security code used to unlock the SIM card of mobile phone, and it is one of the important measures to protect the personal information and communication security of users. PUK codes are usually provided by operators to users, and each SIM card has a unique PUK code. When the user repeatedly enters the wrong PIN code, the mobile phone will be locked. At this time, you need to enter the correct PUK code to unlock it.
The main function of PUK code is to protect the information security of mobile phone users. If the user's mobile phone is stolen or stolen, even if the mobile phone is taken away by malicious users, it is impossible to make calls, send short messages and use the network, thus ensuring that only the user himself and other authorized users who have obtained the PUK code can use the mobile phone and SIM card. In addition, PUK code can also help users reset PIN code and SIM card password, further protecting users' privacy and data security.