1. When the SIM card PIN is entered incorrectly one time, a prompt will appear as shown in the picture. There are two more input opportunities.
2. After entering it twice, it shows that there is one more time as shown in the picture.
3, when the input error three times, will appear as shown in the figure will be prompted "must contact the operator to unlock the device for you. You need to check the PUK code of the SIM card online to unlock the device.
4, first of all, open the official website of China Unicom, click on the location shown in the figure below to open, as shown in the figure.
5. Enter the service password or SMS verification code to log in.
6, click the arrow shown avatar query personal information.
7, in the lower right corner of the interface, you can see the information as shown. The arrow is the PUK code of the Unicom card.
8, and finally enter the unlocked phone to complete the effect picture.