SubscribeiPhone: Frozen or Locked Up Screen
Posted on Nov 26, 2007 under Hardware Tips |What to do if your iPhone screen is frozen or locked up.
Force Quit
Press and hold the Home button below the screen for at least six seconds, until the application you were using quits.
Hard Reset
Press and hold both the Sleep/Wake button and the Home button for at least ten seconds, until the Apple logo appears.
Source: iPhone Users Guide
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