HOWTO | ASSIGN VIBRATION PATTERNS TO EVENTS
1 Set when to vibrate
Go to Settings > Sounds. At the top of the page, decide whether your iPhone should vibrate whenever a call is received and all sound is turned on (Vibrate on Ring), and if it vibrates when the Mute switch on its side is engaged (Vibrate on Silent); you might leave the latter off if you attend a lot of meetings and don’t want even a subtle vibration to seem rude.
2 Events that can vibrate
Further down the Sounds settings page is a list of events that trigger sound effects. What isn’t immediately clear is that these items can have a vibration pattern assigned as well as – or instead of – a sound. Tap one and you’ll find a Vibration setting; it’s above the list of available sounds, so depending on which of those is selected, you might have to scroll up to see it.
3 Assign a vibration
Tap the Vibration setting and you’ll be presented with standard patterns made by Apple. It’s set to None by default for the majority of events. Tap the patterns in the list to try them out. You might well find that Apple’s own are distinctive enough if you only want to assign vibration patterns to a few events. However, you can be more specific with pattern assignments.