Nielsen: In the U.S., white men carry the dumbest phones by Philip Elmer-DeWitt @FortuneMagazine May 7, 2012, 3:52 PM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons Click to enlarge. FORTUNE — The move from so-called feature phones to smartphones continues apace. As of March 2012, 50.4% of U.S. mobile subscribers owned smartphones, up from 47.8% in December 2011, according to a Nielsen survey released Monday. Google’s GOOG Android was the most popular smartphone operating system (48.5%), while Apple AAPL was the No. 1 manufacturer (32%). No surprises there. It’s when the data are broken down by sex and ethnicity that things get interesting. According to Nielsen: 67.3% of Asian Americans use a smartphone as their primary mobile handset, more than any other ethnic group. Almost three out of five Hispanic mobile subscribers use smartphones 54.4% African-Americans own smartphones More than half (50.9%) of female mobile subscribers carry smartphones, compared with 50.1% for men. More than two out of three 25-34 year olds use smartphones. Which leaves, I guess, older white men carrying around the bulk of the remaining dumb phones. For more on the survey, click here.