Try doing a full reboot on the iPhone. Hold the "home" button and the "sleep/wake" button on the top right until the unit turns itself off. (you will probably see the "slide to turn off" screen pop up, ignore that and keep holding the buttons down.) It might restart itself but if it does not then hold the "sleep/wake" button until you see the apple logo on the screen. It might take a few minutes but don't worry, the phone is doing it's thing.
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