I also received a Lumina 920 at MS Build but have a different issue. I have been to the ATT store three times and they tell me that they can't enable LTE on my phone becuase the IMEI shows in their system as a Blackberry and can't be changed by ATT. They clain Nokia is the only one who can fix this.

But, Nokia support tells me that the IMEI shows up as a 920 and that ATT need to fix this.

Has anyone got a solution?