Phone Silent Mode & Vibration Icon Visual Guide for Mobile Settings #3729525 Clipart Library Stop, mute, and change message notifications on iPhone Apple Support (AU) 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, Completed Solutions to iPhone not Vibrating for Texts Calls This tiny component inside your phone is responsible for every silent alert you feel. Its called a vibration motor, and when it spins or oscillates at high speed, it creates controlled vibrations How to Mute Calls on iPhone? How to Turn Off Call Sound on iOS?