After the release of iOS 6.1.3, yesterday which fixed a lockscreen flaw that allowed access to contacts, a new security opening has been found in the iPhone 3GS, 4, 4s, 5 and iPad 2,3,4. The update also blocks jailbreaking by EvasiOn and fixed other problems.
For data thieves with time and the iPhone in their hands they can get past the security code by using voice control to dial a number. Ejecting the SIM card during the dialing, will end the call and give open access to the address book and photos on the iPhone. The way to stop anyone from doing it is to shut off voice dialing.