If you hear an iPhone vibrate when it's charging, you may have an accessory problem. Faults in adapters or cables may make the iPhone vibrate constantly or at regular intervals whenever you plug it in. Alternatively, the iPhone may have a bug, which you can cure with a restart or reset.
Check Charging Devices
An iPhone may vibrate if you're using a faulty power adapter or USB cable. If a charging accessory isn't working correctly, it may have difficulty connecting the iPhone to the power source, making it vibrate each time it reconnects. Disconnect the iPhone from the cable. If it stops vibrating, the accessory is likely to be the source of the problem.
Check the charger or cable for external damage and make sure that connectors are clean and debris-free. Examine the charging port on the iPhone to see if it has any dust or debris in it. If it does, clean it out gently, making sure to pull dust out rather than push it in.
If you have an alternative power adapter or USB cable, swap it for the original and see if that charges the iPhone without making it vibrate. If the iPhone charges without buzzing, the original adapter or cable is faulty.
If you don't have a spare power adapter or USB cable, switch your charging method to see if that fixes the problem:
- If you've been charging by adapter, remove the cable and use it to charge the iPhone on a computer's USB port. If the adapter plug was the problem, the USB cable may still work.
- If you've been charging by USB, try the charger cable in a different port. Or, if you have an adapter, plug the cable in and try to charge the iPhone that way. This may work if there was a problem with the connection between the USB cable and a port.
Shut Down the iPhone
If switching the charging accessories doesn't solve the problem, or if the iPhone carries on vibrating after you disconnect it, you may have a system bug.
Hold the Sleep/Wake button and then swipe the Slide to Power Off slider to shut down the iPhone. Hold the Sleep/Wake button again to restart.
If the iPhone is still vibrating, try a reset. Hold down both the Sleep/Wake and Home buttons, releasing them when you see the Apple logo. The iPhone will reset and restart.