Handsets running Google’s Android OS accounted for a greater share of new smartphone subscribers in the second quarter of 2010 in the U.S. than did iPhones, according to the latest data from Nielsen. BlackBerry devices accounted for the most new subscribers in the U.S. during Q2, representing 33% of the market—a 3% drop from Q1—followed by Android handsets, which jumped from 17% in Q1 to 27% in Q2, enough to drop Apple into third…