In Sharp Increase Over Last Year, Over Half Of Adults In U.S. Own Smartphones

SAN FRANCISCO, CA - JUNE 05: A pedestrian uses a smartphone as he walks along Market Street on June 5, 2013 in San Francisco, California. According to a study by the Pew Internet & American Life Project, over half of American adults, or 56 percent, have smartphones, up from 35 percent two years ago. (Photo by Justin Sullivan/Getty Images)