so some clarification for people who don't know...
Nokia does not put unlock codes on phones. AT&T does. AT&T has the codes, contrary to what they say. When I spoke with Nokia (2 different people) they confirmed this and told me AT&T had to unlock the phone.... no success to date.
@neomesis
If this works I think us as a Lumia 900 unlocking community need to find out HOW this software hack works so we can do it ourselves. Not all phones require codes. Some are unlocked by modifying the boot-loader, some by modifying files, etc.
If this works we have to find out what they did!!!!