Apple released iOS 6.1.3 yesterday. Someone already found a way to bypass the lock screen. The good news is that it’s only in older (non-Siri) iPhones with voice dialing enabled.
The video above shows how it works. It involves some voice dialing trickery and some playing with the SIM card. The user can then access photos and the address book. Again, this doesn’t seem to work on the iPhone 4S or iPhone 5, because they support Siri.