According to the latest research from the NPD group, Apple has got its second wind in smartphone sales. In the same quarter that saw the iPhone 4S reinvent the wheel obey our every vocal whim, the trio of available models soaked up a total of 43 percent of the US smartphone market in Q4 2012, apparently knawing away at Android's market share of 53 percent held during the rest of 2011. However, Google's mobile OS appears to be the debutante smartphone of choice, cornering 57 percent of new purchases, with 34 percent going for Apple. The remaining 9 percent is distributed between the smartphone also-rans, with the likes of Windows Phone and BlackBerry languishing in that anonymous grey bar at the top. The top five handsets from NPD's Mobile Phone Track service is an Apple and Samsung love-in, with iOS devices claiming the three top spots, followed by the Samsung Galaxy S II (we assume collectively) and the Galaxy S 4G. NPD's blow-by-blow commentary on this increasingly two-horse race awaits below.