Lumia 800 and N9 have the same body , Lumia 900 shares the same design with some lil changes here and there , but in wp8 nokia changed the design starting from Lumia 820 (as it was the first device launched , soon Lumia 920 was showcased ) , true Lumia 800 is BEST , my close pal still use Lumia 800 as his daily driver , he isn't going to upgrade just because he loves the design and fluid OS