That’s done today 40 days than iPhones firmware 1.1.2 provided with bootloader 4.6 are on sale.
To date, only the method TurboSim allows a total unlock of this firmware version OOB (Out of the box). Although this TurboSim is very difficult to find or at an exorbitant price.
The hackers (Dev team) say they are waiting the next firmware version (1.1.3) which would allow the unlocking.
Other people like iBelgium (member of the forum) is interested in a plausible theory:
What if Apple had paid hackers to fight piracy?
Did Steve Jobs have an appointment with the dev team?
We discuss it on the forum.