Some Apple iPhone owners might experience a problem with their devices where vibrate no longer works as it should. The problem is quite common. Here are a few things to try if you are experience this issue.
Ensure Setting is Set Properly
From the Home screen, select “Settings” > “Sound” and ensure that “Vibrate on Ring” and/or “Vibrate on Silent” is set to “On” (green).
Loosen Vibrate Device
Sometimes the vibration device inside the phone can become stuck. A gentle tap to the back of the device will often loosen it up. Some users have suggesting calling the iPhone from another device while tapping it works well.