Press and hold either volume button and the side button until the power-off slider appears. Drag the slider, then wait 30 seconds for your device to turn off.
If iPhone isn't responding, and you can't turn it off then on, try forcing it to restart. Press and quickly release the volume up button. Press and quickly release the volume down button. Press and hold the side button.
Restart your iPhone or iPad. Make sure that your screen is clean and free of any debris or water. Disconnect any Lightning or USB-C accessories. If your screen works after removing an accessory, try using a different outlet, cable, or charger.
If force restarting is not working at all, you may need to repair it with PhoneRescue. Also restoring iPhone is another way when you already created an iPhone backup or you don't worry about data loss. Now, download PhoneRescue and start fixing your problem!
The most likely reasons why your iPhone won't turn off are: It's frozen due to software problems. The Sleep/Wake button is broken. The screen is broken and isn't responding to taps.
If your phone is frozen with the screen on, hold down the power button for about 30 seconds to restart.
There are mainly two reasons for your phone and tablet touch screen not working. Either the touch screen might have been damaged, or the device has technical issues. If you drop your phone and get stuck against any object, the touch screen's connectivity can get damaged.
So what cause the "slide to unlock" and "slide to power off" doesn't work on iPhone? Well, either software problem or the hardware issue is the reason. For hardware problems, there could be the glitch of touch screen sensitivity, short circuit, or the broken mainboard or screen.
Your battery is low. Your iPhone is running out of storage space. Certain apps are incompatible with your software. Your operating system is outdated.