Android now enjoys the largest installed base of any smartphone operating system in the U.S., according to the latest data from Nielsen. As of March 2011, the report states, 37 percent of U.S. smartphone users own an Android device, followed by 27 percent who use an iPhone, and 22 percent who use a RIM BlackBerry. By comparison, Apple held the U.S. smartphone OS lead as recently as November of last year with a 28.6 percent share of the market, compared…
