If you think you’ve seen a lot of teens with iPhones lately, that’s because the popular Apple device may be owned by nearly half of all U.S. teens, according to a new survey, the Los Angeles Times reports. Investment bank research firm PiperJaffray released its Taking Stock With Teens survey in which 48 percent of the teen respondents said they owned an iPhone. That’s up from last fall’s 40 percent. The report said the increase was driven by sales of iPhone 5, which hit stores last September. Apple’s smart phone was also the most preferred. According to the survey, 62 percent of teens planned on making the iPhone their next mobile device purchase. The results were compiled from classroom visits and electronic surveys and involved 5,200 teens…