The surge in interest for Nokia Lumia models isn't coming from just one model. It includes the high-end phones like the Nokia Lumia 928 all the way down to the Nokia Lumia 520. Of course, the challenge for Nokia is turning all of this interest into sales. Right now, it looks like BlackBerry is in the midst of a sharp drop in U.S. market share according to data from Kantar WorldPress.
From May 2012 to 2013, BlackBerry's U.S. market share dropped from 4.6% to .7% while Windows Phone has seen its slice of the U.S. smartphone pie rise to 4.5% from 3.7% in the same time period. Based on Kantar's numbers, that puts Windows Phone in third place in the states well behind iOS (41.9%) and top ranked Android (52%).