My post about forcing a frozen iPod to restart seems to be very popular so I thought I’d post a similar article for those of you with iPhones.
How to force shutdown (reset) an iPhone: To force shutdown/reboot the iPhone 3G, press the sleep/wake power button first followed by the home button. Hold the buttons down for a few seconds until the screen changes. You should see the black background and white Apple logo to indicate the reset was successful.
Quit a frozen iPhone application: Very occasionally you may find that an iPhone application can freeze and lock up. To resolve this simply hold the Home button when in the application for about 6 seconds to quit it. You should then be able to reopen the application without restarting the phone.
Hope you find this useful…