What's wrong with the mobile phone text message not ringing but vibrating?

Press the voice on the left to adjust the volume, and see if the two switches on the volume adjustment on the left (this switch is adjusted left and right, not pressed) are turned off.

Turn up the volume in the music player, and turn up the volume in Settings-Sounds-Ringtones and Reminders.

Enter Settings-Do Not Disturb Mode-Settings allow anyone.

Enter Settings-General-Accessibility-Incoming Calls-Speakers

If all the above methods fail, go to Settings-General-Restore.

Still not working. That may be that your horn is broken.