According to the newspapers, the Mosquito ringtone is "inaudible to those over 25, and growing numbers of teens are using it to take calls undetectded by parents and teachers"
But children, I CAN hear IT.. and rather clearly too.. its VERY ANNOYING...
so don't even think of trying it in class..
Test it yourself
this is the original one from bbc.. see if u can hear the sound, or just the ambient noise outside the store..