If your iPhone shows a black, unresponsive screen, start by checking for physical damage or charging the device for at least 15 minutes. If that doesn’t help, force restart your iPhone or update its ...
If your iPhone is showing a black screen that never goes away, you should try resetting it or putting it into recovery mode.
To zoom out to normal size, hold three fingers together and double-tap the screen with all three fingers at once. To turn off ...