Mr. George Hotz, guardian of the freedom of the iPhone, granter of hope to the masses, owner of a Nissan 350z, has once again graced us with an unlock solution we were waiting on, as you may have seen.
I've packaged it up for Installer now [UPDATE, NEW INSTRUCTIONS], if you have an OTB 1.1.2/1.1.3, you will need to:
downgrade to 1.1.1,
jailbreak,
install this package,
OkToPrep and updgrade/jailbreak 1.1.2 (just hold down Option (shift in Windows) while pressing upgrade, and point iTunes to the 1.1.2 firmware file)
and then install the DevTeam upgrade to get back to 1.1.3.
You'll wind up with an unlocked 1.1.3 with the 4.6 BL. (thanks, BigBoss, for suggestion).
I will be looking into a native app to run this, so you can run it straight from 1.1.3. I'll let ya know.
DO NOT RUN THIS ON A 3.9 BL iPHONE - it will be bad.
Enjoy!