Will the AT&T Lumia 920 work in Canada if unlocked?

As many of you know the only 920 available in Canada is from Rogers and is only available in black. It would be awesome to get one from the states that is $100 cheaper and also has the option of colour .If any of you have anything about successful AT&T 920 unlocks without any restrictions (mms, tethering) it would be great if you would let me know.