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How to take a screenshot on your iPhone
To take a screen capture of the iPhone, press and hold the Home button that is located at the bottom center. While you hold the home button, also press the Sleep / Wake key on top of your iPhone and a screenshot of the existing screen will get saved to your iPhone photos folder. The screen will flash to indicate that a screenshot has been captured.
Video of how to take a screenshot on the iPhone 4
Video of how to take a screenshot on the iPhone 5