Download the free Mosquito Ringtone if you’re young, fresh and have a set of good ears. Once it’s installed on your mobile phone only you and your peers will be able to hear it when it rings, oldsters won’t, so you can receive calls wherever you are and whenever you want. It’s one more way to stick it to the wrinklies, dude.
The short version, A tone outside the audible range of hearing for most people over the age of 30. This means that you can get phone calls and receive text messages in class or school without teachers hearing it.