how do i enable vibration alerts

Hi there,

Thanks for the clear question! To change Vibration/Haptics on iPhone do the following from Apple Article: Change iPhone sounds and vibrations - Apple Support

Set sound and vibration options

1. Go to Settings  > Sounds & Haptics.
2. To set the volume for all sounds, drag the slider below Ringtone and Alerts.
3. 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.
4. Tap Ringtone or Text Tone.
5. 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.

Hope that helps,

Adin