How to Turn off or restart Phone without Power Button
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If the power button is broken on your Android phone or devices, How can you restart it? The answer is pretty simple.
1- Enter Playstore and download Assistive Touch app
2- Customize Assistive Touch menu and add the power button
3- Now when you press the power button, shutdown options will appear.
Note: Now if you press the power button from the program, shutdown or restart options appear and click restart.