Researchers are having a fun time with iOS 6.1 passcode locks this month, with Vulnerability Lab having discovered a second version of a vulnerability that lets a hacker slip past a lock screen to access a user's contact list, voicemails and more.
The first vulnerability, which popped up on YouTube earlier in the month, entailed this laundry list of steps, brought to us courtesy of Naked Security's Paul Ducklin:

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