According to gadget news site Gizmodo, the iPhone Dev Team is making steady progress towards their goal of freeing the Apple iPhone from its AT&T network lock.

The team has announced that the software that controls the phone's radio communications has finally been reverse-engineered. Gizmodo noted, however, that total unlocking is still quite a ways away.

Apparently, the work done on reverse-engineering the software has revealed that the iPhone has two layers that need to be explored further to fully unlock it. The first layer is the phone's main operating system, Mac OS X.

The second layer is the Nucleus Real Time Operating System which runs on a secondary chip and controls access to the baseband's memory. According to the iPhone Dev Team, the latter is one of the fronts that they could possibly use to "access or disable the lock from within the system."