OPPO A57 4G

OPPO A57 4G

Android 12.0

I can't start my OPPO A57 4G Android 12.0

Cause 1 of 6: Your phone is locked to another operator

If your phone is SIM locked to another operator and you try to use a Vodafone SIM, the screen will tell that your SIM is invalid.

Solution: To get the unlock code, contact the operator.

OPPO A57 4G