We admit, the vibrating alerts in some phones are extraordinarily loud, often too loud to be discreet. And if the phone is sitting on a hard surface? Forget it. Motorola's BUZR could be years away, if we ever see it at all, so what's a mischievous, cellphone-toting student to do when phones are banned from class? Rumors are flying that students in the UK have recorded the sound produced by a device called the Mosquito, designed to disperse roving gangs of teenagers by emitting a sound that can only be heard by youngsters. By using the recording as their ringtone, they hear it (along with their friends and any nearby canines) while the poor headmaster is left in the dark. It's debatable whether your average cellphone is capable of producing sounds in the range necessary to elicit this effect, so this may be nothing more than a rumor, but if you see packs of dogs belting out some tunes near the local high school, you know what's probably going on.