Oppo mobile phone calls have no sound. How to recover?

1. Check whether the option "Turn off all sounds" is set: Menu-Settings-Accessibility-Turn off all sounds, and uncheck it.

Second, check whether the speaker is silent:

1, make a phone call to test whether the receiver and message are normal. If the mobile phone is tested normally, it is more likely that the speaker will fail, so it is recommended to send it for repair. 2. Test whether playing music is normal with original headphones. If the earphone works normally, the speaker is likely to fail, and it is recommended to send it for repair.

Third, eliminate software conflicts: backup mobile phone data (phone book, SMS, multimedia files, etc. ) and restore factory settings (menu-Settings-Reset-Restore factory settings).