The sound of the vivo smartphone speaker is relatively small, which is generally caused by the ringtone volume being set to a low value.

You can use the following methods to troubleshoot:

1. Enter Settings-Sound-Check whether the volume setting is correct

Specific steps (take vivo X9 as an example) :

1. Enter settings

2. Sound

3. Adjust the volume

2. Check whether there is any foreign matter blocking it The speaker hole of the mobile phone

3. You can enter Settings-More Settings-Restore Factory Settings-Restore All Settings

Specific steps (taking vivo X9 as an example):

1. Enter settings

2. More settings

3. Restore factory settings

4. Click Restore all settings and select Restore

4. Take your mobile phone to the local after-sales service center for testing. Go to Settings-More Settings-After-sales Outlets (After-sales Service) to check the after-sales address information.

Note: Restoring all settings will not delete the data in the phone, but will restore all settings in the phone, including: set wallpaper, unlocking style, WiFi, default open programs, etc.