Nearly two out of every ten U.S. teens now owns an iPhone, according to the results of the latest Piper Jaffray bi-annual teen survey. Fortune reports that 17 percent of teens said they own an iPhone, up from 14 percent in the October 2010 survey. Perhaps more importantly, 37 percent said they plan on purchasing—or having their parents purchase for them—an iPhone in the next sixth months, up from 33 percent in the prior survey. 22 percent…
