1. For a few seconds, press and hold the Sleep/Wake (Power) button until the 2. Slide to Power Off screen displays.
3. To totally turn off your gadget, drag the slider.
4. Hold your breath for at least 30 seconds.
5. Press and hold the Power button until the Apple logo appears on the screen after the timer has expired.
Your iPhone restarts. Make a test call when it has fully booted up to determine if your iPhone is already ringing for incoming calls.