Are your students using their cell phones in class?

I thought this was pretty interesting. Apparently, there is a device that's being used in certain places called a "Mosquito" that emmits a high frequency that can only be heard by most people under the age of 20. Most people over the age of 30 don't hear it at all, so it is used to keep loitering teenagers away from certain areas. You can read the article here.

Teens have begun using this technology to their advantage and have recorded the noise and saved it as their ringtone for their cell phones! That way, they can text message and call each other in class without any teachers being the wiser! Teachers, you've got your work cut out for you now!