Change iPhone sounds and vibrations - Apple Support (CA)
It looks likes any number of things might have been changed.
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Set sound and vibration options
- Go to Settings
> Sounds & Haptics. - To set the volume for all sounds, drag the slider below Ringtone and Alerts.
- Tap Haptics, then choose the haptics behavior for ringtones and alerts—Always Play, Play in Silent Mode, Don’t Play in Silent Mode, or Never Play.
- Tap Ringtone or Text Tone.
- At the top of the Ringtone or Text Tone screen, tap Haptics, then do any of the following:
- Choose a tone (scroll to see them all).
- Ringtones play for incoming calls, clock alarms, and the clock timer; text tones are used for text messages, new voicemail, and other alerts.
- Choose a vibration pattern or tap Create New Vibration to create your own.
You can also change the sounds iPhone plays for certain people. Go to Contacts
, tap a person’s name, tap Edit, then choose a ringtone and text tone.
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I vote for #3 as the most likely suspect.