In this video, the instructor shows us how to perform a reset on an Apple iPhone and iPhone 3g. You will want to perform this when the phone will not turn on or is just unresponsive. To perform this, hold down the top bottom and home button simultaneously for approximately 10 seconds. You should see the power bar come up but keep holding the buttons and the Apple logo should show up. After the Apple logo appears, you can remove your fingers and your phone will reboot. The regular home screen will show up after a few seconds and it will be back to normal!