To turn the device on, press and hold the Power/Lock key until Apple logo appears.
To turn iPhone off, press and hold the Power/Lock key until the red slider appears, then drag the slider.
To unlock iPhone, press either the Sleep/Wake or Home button, then drag the slider.
If you are unable to turn your device on, plug the device into a power source for 15 minutes, and then try again.
If your device stops responding, you can reset it by pressing and holding both the Power/Lock and Home keys for at least ten seconds, until the Apple logo appears.