1, press the volume plus key to turn up the sound;

2. If a Bluetooth headset or wired headset is connected, please disconnect it and try again;

3. Close the background running software and try again;

4. Enter the mobile phone settings-turn off the mute mode in sound and vibration, and set the mobile phone to ring mode; Enter do not disturb mode and turn off "Manual Start/Timing Start";

5. Check whether there is sound during the hands-free telephone call, and eliminate the abnormality of playing music, video and other resources;

6. If the mobile phone is broken, liquid is put outside and ash is put inside. , may affect the sound, please take the phone to the customer service center for testing;

7. Please ensure that the position of the external sound hole is not blocked or blocked, such as protective shell, dirt, etc. If the sound hole is blocked, you can try to clean it or take your mobile phone to the customer service center for cleaning;

8. Restart the phone;

9. Enter Settings-System Management/More Settings-Backup and Reset/Restore Factory Settings-Restore all settings;

10. If the above methods can't help the recovery, it needs to be detected and handled by the customer service center. Address of customer service center: Go to official website /vivo Mall APP-My-Service outlets or vivo official website Web version-Slide to the bottom-Service Support-Service outlets query-Select provinces and cities to query the address of customer service center. It is recommended to call in advance before going to avoid empty running, plan your trip reasonably and travel safely.