Xiaomi's mobile phone pin? How to unlock it?

PIN code is not the password of mobile phone. If you are a Unicom mobile phone user, Unicom SIM card is protected by PIN code and PUK code. The initial password of PIN is 1234. If the password is entered incorrectly for three consecutive times, you need to enter the PUK password to unlock it. PUK code * * * has 10 input opportunities. If 10 enters all PIN codes incorrectly, the SIM card will self-destruct. At this time, it can only be supplemented by Unicom business hall.