How to Turn Off an iPhone When the Screen Freezesby Stephen Lilley
If it's been days (or even weeks) since you've rebooted your Apple iPhone, you may notice that its performance decreases over that time. The screen itself may actually freeze and become unresponsive, no matter where you touch it. If this occurs, you can still turn off your iPhone and turn it back on by performing a "hard reboot" which forces the device to shut down, no matter what.
Press down on the silver "Sleep" button on the top side of your Apple iPhone. Hold this button down.
Press down on the single circular button on the face of your Apple iPhone. Hold this button down.
Continue to hold these two buttons until your screen turns black. Once this happens, the white "Apple" logo will appear on screen. Release the buttons. When your "Home" screen appears, you can continue to use your iPhone as normal.
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