I heard about The Mosquito, the teenager repellent noise, a few weeks ago, and thought it was an interesting idea. Then early last week, I read that teenagers had co-opted it and turned it into a ringtone. At the time, I shrugged it off as BS, because I was pretty sure that cell phones’ speakers did not have the range to reproduce such sounds. Then today, I saw a New York Times article (sell your soul required, etc.) and a similar Times (UK) article about teens using the sound to hide the ringing of their phones from adults. The NYT article states that the tone is right around 17KHz and the Times cites a version that’s 15KHz. Both are still well inside my audible range, but I can’t imagine why a cell phone speaker would be able to reproduce that sound.
So, Dopers: what are the upper and lower limits on the frequency that a cellphone speaker can reproduce? Is the Mosquito ringtone real, or just buzz?