OPPO A57 4G
Android 12.0
We have found 1 possible solutions to your problem.
Before you start this troubleshooting guide you need to check one important thing:
Does the phone ring at incoming calls?
Yes
No
Why do we ask this question?
It's important to find out if the phone rings at incoming calls. If the phone doesn't ring at incoming calls, you need to solve this problem first. When the problem is solved, you will most likely also be able to hear the message tone.