Nielsen's just released a study confirming what some other studies have already concluded -- that Android devices account for the single largest swath of smartphone users in the US, with 39 percent OS share as of the second quarter. That compares with 28 percent for iOS, although Apple still reigns as the country's top-selling device maker. Simply put, that's a reflection of the fact that Apple is the only outfit churning out iOS devices, whereas a bevy of companies led by HTC, Motorola, and Samsung have helped make Android the dominant OS in the s
