ID3 vTOPE NPRTCOM Melissa BlockTALB All Things ConsideredTIT2 0 Teens Turn 'Repeller' into Adult-Proof RingtoneTCOP 2006TRCK 9TCON TechnologyCOMM 7 nprComment Shopkeepers in the United Kingdom have been using the ultasonic Mosquito teen repellent to stop teenage loitering. But now, teens are using the high-pitch frequency that most adults can't hear as a text message alert while they're in class -- where they're not supposed to be using their cellphones.TPE1 NPRTYER 2006 P , k'' @0( <,t xE +6*_'LsȘ`oB.ESˆnLѐA AB b켯/]+1F+b~q6oLӔeQn`FUcWR_Vn\`wwY>P0 AYMkBKÖg6 Yε|c_y Em %n~E&ZuÎZTRYKG(XqY6vM)= zjj%k_F;eq