- For a few seconds, press and hold the Side/Power button and either
Volume button at the same time.
- Release the buttons when you get the Slide to Power off prompt.
- To turn your phone off, slide the Power switch to the right.
- After around 30 seconds, press and hold the Side/Power button until you see the Apple logo.
Wait till your iPhone has completely booted up before launching YouTube to determine whether it's already functional and reliable.