Google’s Android OS continues to the lead the U.S. smartphone market, according to the latest data from Nielsen. In February-April 2011, Android held a 36 percent share of the U.S. smartphone market, compared to a 26 percent for Apple iOS and 23 percent for RIM’s Blackberry. Interestingly, while a higher proportion of iPhone owners said they engaged in “heavy data use” activities—including downloading apps of full music…
