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Jailbreak Nation found a bug with iOS 6.1 that allows users to bypass a passcode lock on an iPhone



From MacRumors:
The issue does appear to have been present in earlier versions of iOS as well, as Gizmodo points to a YouTube video posted in late January claiming that the method also works on iOS 6.0.1 and 6.0.2.

Similar bugs have appeared in previous versions of iOS, and Apple has generally moved fairly quickly to incorporate fixes into subsequent software updates once it becomes aware of the issues.
  iOS 6.1 Bug Enables Bypassing Passcode Lock to Access Phone and Contacts