Why can't oppo phones even hear breathing?

Why can't oppo phones even hear breathing?

1.

Check whether the speaker is blocked or blocked (such as the influence of protective sleeve/shell or film) and clean it with a soft brush.

2.

Restart the phone to see if it is restored.

3.

You can pull down the status bar of your mobile phone and try to set it to ring.

4.

Check whether the speakerphone volume is normal, confirm whether it is a video or player problem, and eliminate abnormal resources such as video and music.