Teens use ringtone adults can't hear

God bless the U.K., because without it there'd be fewer odd mobile phone stories.

The latest: Teens are downloading a ringtone that can be heard by their peers, but not by adults.

The high-pitched alarm, which was originally intended to drive teen gangs away from shopping centers, has been turned into a ringtone known as "Teen Buzz."

The ringtone allow students to receive calls and text messages during class without their teachers' knowledge.

Said one high school teacher in Wales: "One of the other children told me all about it later. I couldn't be too cross, because it shows resourcefulness."

Yet another reason to love our pals from the Mother Country - they use cool words like "cross."