If something isn’t working right, try restarting, force quitting an application, or resetting iPhone.
Press and hold the Sleep/Wake button until the red slider appears. Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and hold the Sleep/Wake until the Apple logo appears.
If you can’t turn off iPhone or if the problem continues, you may need to reset. A reset should be done only if turning iPhone off and on doesn’t resolve the problem.
Press and hold the Sleep/Wake button on top of iPhone for a few seconds until a red slider appears, and then press and hold the Home button until the application quits.
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears.
For more troubleshooting suggestions, see Help.