phone won't ring, only vibrates iPhone 6s Plus iFixit How to repair an iPhone not vibrating on silent or ring mode? 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 Cool phone tip I just learned You can keep your phone on silent and still hear calls or texts from specific people like family, close friends, or co commanders . Here's Here's Why Your iPhone Randomly Vibrates & How to Fix It