Restart Your iPhone
As with restarting a misbehaving Mac, restarting an iPhone is a quick fix for a variety of ills.
Restart
To restart an iPhone, press and hold the Sleep/Wake button (the physical button at the top of the iPhone, next to the SIM card tray) until a red slider with a white arrow appears on the screen. Drag the slider to power off your iPhone. Then press and hold the Sleep/Wake button again until the Apple logo appears. Wait a few seconds for the startup sequence to finish, and you should be back at the Home screen.
Force Restart
If your iPhone is deeply confused, holding down the Sleep/Wake button may have no effect. In such cases, you can usually force the iPhone to restart by holding down the Sleep/Wake and Home buttons simultaneously ...
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