My iPhone Doesn't Vibrate! Here's The Real Fix. If your iPhone screen is completely black but the phone still vibrates, makes sounds, or shows other signs of life, you're likely dealing with a failed OLED display. In this video, I How to Change Vibration Settings on an iPhone iPhone Vibrates for No Reason? What You Need to Know ur.co.uk 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 Why does my iPhone not audibly ring when it's not on silent and the volume is turned all the way up?!? : r iphonehelp