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When vibration is turned on, your phone vibrates when you get a call.
1. Find "Sounds & Haptics"
Press Sounds & Haptics.
2. Turn vibration on or off
Press the indicator next to "Vibrate on Ring" to turn the function on or off when silent mode is turned off.
Press the indicator next to "Vibrate on Silent" to turn the function on or off when silent mode is turned on.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.