I thought it was cute too, explaining so sincerely why porn music makes great cell phone ringtones. The basic spin is that most ringtones are \[.
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The ringtone emits a higher frequency not heard by adults, thereby if any teacher worth their salt finds a student with a cellphone fixed to thier.
The question is whether cellphone speakers can generate these ultrasonic frequencies. Boing Boing posts a comment from one of their readers.
The original ultrasonic ringtone hearing test. Find out your hearing age.