Open the phone’s Settings app
Tap Sound or Sounds and vibration
Turn on Vibrate on ring
Turn on Vibrate on silent
Increase vibration intensity if available
Switch the phone to silent or vibrate mode
On iPhone, use the side switch or Control Center to enable Silent Mode
On Android, press the volume button and select Vibrate
Check Do Not Disturb settings if vibration is disabled
Make sure the phone is not in battery saver mode if it limits vibration
Test vibration by calling the phone or using the built-in vibration test option if available