I have a problem with iPhone Action button. Switching to silent mode when the screen is off vibrates 3x and switching to ring vibrate 1x but the screen doesn't light up. Sometimes, How to turn on Vibration in Silent Mode on iPhone How do I switch vibrate on when my phone rings or I receive messages? I noticed my last phone had stopped try to fix the issue but nothing, I've just upgraded to How to Change Vibration Settings on an iPhone How to put your iPhone on vibrate Fix vibrations not working for calls, texts, and alerts on iPhone