ringtonia.com: Teenager repellent "Mosquito" turned into ringtone: "Remember the teenager repellent called Mosquito I wrote about a few days ago, the ultrasonic device that emits a sound only audible to teenagers? Shopkeepers in England have been installing them in order to prevent anti social youths from hanging out in front of their stores.

Well now techno-savvy pupils have recorded the ultra-high sound - audible only to under-20s- onto their cell phones, and are now receiving calls and text messages in class - without teachers having the faintest idea of what is going on.

The kids call it Teen Buzz, and it's spreading it from phone to phone via text messages and Bluetooth."