I've never heard of this. Wikipedia had this about it, which is pretty hilarious; Some teenagers turned the sound into a mobile phone ringtone, which could not

I've never heard of this. Wikipedia had this about it, which is pretty hilarious; Some teenagers turned the sound into a mobile phone ringtone, which could not be heard by teachers if the phone rang during a class.[38] Mobile phone speakers are capable of producing frequencies above 20 kHz.[39] This ringtone became informally known as "Teen Buzz"[40] or "the Mosquito ringtone" and has since been sold commercially.