The Mosquito Ringtone is a ringtone that is inaudible to adults due to a condition known as presbycusis. Students can use the mosquito ringtone to receive phone calls and text messages in class because most teachers will not be able to hear the high frequency ring tones. May 26, 2006 · Teens Turn 'Repeller' into Adult-Proof Ringtone Shopkeepers in the United Kingdom have been using the ultasonic Mosquito teen repellent to stop .
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