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 drop 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 the video or the player, and eliminate the abnormality of video, music and other resources.

5. If there is unilateral silence or low sound after adjusting audio equalization, you can enter "Settings > Other settings > Accessibility > Audio Equalization ",pull the audio adjustment point back to the middle, restore it to the default position, and then return to normal.

phone setting path of p>ColorOS12 system: "system settings >; Accessibility > Hearing >; Balance the volume of the left and right channels, and pull the audio adjustment point back to the middle.

if it's a hardware problem or the above methods can't solve your problem, I suggest you back up your important data in advance, take your mobile phone and purchase certificate to the OPPO customer service center for testing, and a professional engineer will solve it for you.

due to different models and system versions, the operation path may be slightly different, please refer to the actual operation interface display of the mobile phone.