Turning off your iPhone involves two simple steps. With the touch of a button and a virtual slider, you can shut down your device in a few seconds. If you are having difficulty powering off the device, perform a quick reset to resolve a frozen or unresponsive condition before shutting your iPhone off.
Press and hold the "Sleep/Wake" button on the upper-right edge of your iPhone. A red power-off slider will appear at the top of your screen.
Slide your finger across the slider, from left to right. Your device will then cycle down and shut off.
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Reset your iPhone if your iPhone does not shut down. Your device may be hung up on a frozen or corrupt app. Simultaneously press and hold the "Sleep/Wake" button and the "Home" button for roughly ten seconds until the Apple logo appears. Once your Home screen reappears, repeat Steps 1 and 2 to shut down your iPhone.