If your iPhone isn't responding, and you're not able to power it off and then on again, you can force restart it to hopefully fix the issue. Forcing a restart is different from a normal restart.
If your iPhone won't turn off the usual way, you can force restart it with a button combination specific to your iPhone model.
You can get navigation buttons back on an iPhone using accessibility features. Enable AssistiveTouch to add a floating virtual button for Home and App Switcher, use Back Tap to trigger actions like ...
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