Sorry, but Nokia doesn't mean anything in the US
In the mobile space, in the US, I believe the only brands with any level of attachment are Apple and RIM. The others are just what you get form what's available. I don't believe anyone actively looks for any of the other brands in general. There are exceptions such as when a particularly desirable product emerges, such as in the first half of the 2000's when Motorola's RAZR gained some popularity.
I'm curious, though. What does Nokia pay for WP7 for each phone? I assume they pay a license fee, don't they?
The word on the street is that Microsoft is paying THEM. Which makes some sense. Android was available to them for free (not as in beer). And they already had two platforms baked at home to choose from. The really interesting bit of information is how MS is monetizing this opportunity/venture?
http://www.computerworld.com/s/article/9209259/Microsoft_to_pay_out_billions_as_part_of_Nokia_deal