Apple has just released the iOS 6.1.3 update for compatible iOS devices. While it adds improvements to Maps in Japan, it also fixes the long-standing lockscreen exploit, that can allow users to bypass the lockscreen and go into the Phone application, gaining access to the address book and a number of other things. If you’re jailbroken, follow the golden rule, which is to never update until the O-K is given from one of the jailbreak developers.
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Source: Mac Rumors