For t-mobile america users/cheapskates: it's quad-band 3G unlike the N9's penta-band 3G, so I don't see this phone selling on t-mobile at all. Too bad though, I've been wanting to replace my nexus one with a well-designed easily jailbreakable/sim-unlockable os.
http://www.nokia.co.uk/gb-en/products/phone/lumia800/specifi...
It says it does 850 and 1900, which are T-Mobile bands, no?