Not many people use their cell phone to buy movie tickets, watch videos or play games, but a significant number of Americans are interested in doing just that. That conclusion comes from a national study conducted last month by the Pew Research Center’s Pew Internet & American Life Project, the Associated Press and AOL. The survey found that 6 percent of cell phone users currently play music on their device, for example, while 19 percent wish their phone had that feature. A mere 2 percent watch mobile video or TV, but 14 percent said they would like to.