1. If the lock screen PIN code is set, you can set a password of at least 4 digits.
2. If you are prompted to enter the PIN code after entering the wrong pattern for many times, please enter your own backup PIN code when setting the pattern to unlock.
3. If it is the PIN code of the SIM card, this password is the personal identification password of the SIM card, and you need to contact the network operator for consultation.
4. There is no initial PIN code to restore the factory settings. If you are prompted to enter a password when restoring the factory settings, this password is the set screen lock password.