The voice of vivo mobile phone suddenly changed in the receiver. How to change it back?

You can try restarting your phone. If the problem persists, you can try the following methods.

1. Try setting->; General/More Settings-> Restore factory settings-> Restore all settings "2. Click "Settings->; General/More Settings-> System upgrade-> Check for updates now upgrade to update your system. 3. Try "Settings->; General/More Settings-> Restore factory settings-> Clear all data "Clear abnormal data. Note: This item will lose all the data stored by the user on the mobile phone, including phone book, SMS, third-party application software and related account information, and the data stored on the T card will not be lost. Use with caution. 4. You can try firmware upgrade. The firmware download address is/service.htmlfirmware upgrade description:/thread-1024055-1-1.htmlIf the above methods cannot be solved, please consult the after-sales service center. The address of the after-sales service center is in the Settings-General/More Settings-After-sales service menu. You can also check the address of the after-sales service center in vivo official website:/service/map.html.

If you have any questions, please feel free to consult us. Thank you very much for your support of our vivo. I wish you a happy life!