There is a new ringtone called "Teen Buzz" that uses higher frequencies so that adults cannot hear the ring. This apparently helps them to use their text messaging devices during class when they are not supposed to. The sound was originally developed by a European company to help store owners drive loitering teenagers away from the front of their store. See article at MSNBC.
Ummm... I could be missing something here but, couldn't you just set the ringer to "vibrate"? I guess I should not make the assumption that all phones and messaging devices have a vibrate feature.
Interesting technology nonetheless. If you want to see if you can hear it, go here.
J
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