Current iPhone software controls call and alert vibration through the Haptics settings. If your iPhone is not vibrating when you expect it to, check the haptic behavior under Sounds & Haptics.
How to Turn On Haptics for Calls and Alerts
- Open Settings.
- Tap Sounds & Haptics.
- Tap Haptics.
- Choose the option that makes haptics play in the situations you want, such as always or according to Ring/Silent mode.
Choose a Vibration Pattern
In Sounds & Haptics, open a sound category such as Ringtone or Text Tone, then choose its Haptics option. You can select an available haptic pattern or create a custom vibration where iOS offers that option.
Keyboard Haptics Are Separate
If you want a small vibration when typing, go to Settings > Sounds & Haptics > Keyboard Feedback and turn on Haptic. This setting is separate from call and alert haptics.
If the iPhone Still Does Not Vibrate
Review the Haptics selection again, test more than one alert type, and restart the iPhone. Also check Settings > Accessibility > Touch > Vibration; if Vibration is off there, system vibration is disabled. If haptics fail throughout iOS after the settings are correct, the phone may need further troubleshooting or service.
Summary
Go to Settings > Sounds & Haptics > Haptics and select when you want haptic alerts to play. Ringtone/text vibration patterns and keyboard haptics have their own controls.