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British schoolchildren have created high frequency ringtones that adults cannot hear. Mobile phone calls inaudible by teachers are now heard right in the classroom. The smart students have adapted the Mosquito signal, which is used in shopping malls to scare off groups of teenagers. This signal, which was highly appreciated by the police, does its job effectively, as ultra-high sound is heard only by teenagers and not heard by people over 20 years old.

The schoolchildren recorded the sound of the Mosquito, and a super hit ringtone called "Teen Buzz" quickly spread to the kids' phones via text messages and Bluetooth. Now teenagers can rejoice: they can receive their favorite SMS-ki and even calls right during the class. Mosquito technology is based on the medical phenomenon of presbycusis, or age-related hearing loss. It turns out that at the age of 20, people stop hearing high-frequency sounds (18-20 kHz).