Nielsen has released some data collected between March and May 2013. The numbers show 2% of US smartphone users have Windows Phones.
The number is up from 1.3% in Q2 2012. Unlike Comscore Nielsen counts only Windows Phones, not Windows Mobile handset.
|Q2 2012||Q2 2013|
It seems Blackberry is the biggest loser over the period, having dropped from 9% to 3% of the market, with the iPhone gobbling up much of their fleeing users.
With around 138.5 million Smartphones in use in US in April 2013 according to Comscore, the numbers suggest 2.8 million Windows Phones are in use in USA, and at least 1.35 million have been sold in the last year, doubling the user base.
Of course these are just rough estimates, and Comscore and Nielsen prefers their numbers not be multiplied together.
With Nokia having sold more than 20 million Windows Phones so far, the numbers however continue to show USA is only a minor Windows Phone market.