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Use this guide to force restart your iPhone 4 when it is frozen and not responding. This procedure clears out your iPhone's RAM, which becomes fragmented over time. Force restarts are very simple and require no tools.
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Press and hold the Home button.
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While holding the Home button, press and hold the Sleep/Wake button.
 
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Continue holding both buttons for about 10 seconds, until the Apple logo appears.
 
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