Sometimes an iPhone app will become unresponsive, and no matter what buttons you press or where you touch on the screen nothing happens. In this event, sometimes it helps to force quit the application.
Apple has made some changes with the iPhone OS 3.0 firmware and the iPhone 3GS release. Those with older iPhones will remember that to force quit an application you could just hold down the home button until the app exited.
This is still the case on the original iPhone and iPhone 3G, no matter which iPhone OS version you are running:
Just hold down the home button until the application quits.
For those with the iPhone 3GS, the procedure to force quit an app is slightly different:
First hold down the Sleep/Wake button on the top of the iPhone until the Slide to power off message appears. Then press and hold the home button until the application quits.
With the unresponsive application exited you can now go about your business.
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