specific tips on what to do including limiting cell phone use by children, using a headset, using belt clips, avoiding cell phones in weak signal areas. this is something, again, we've been reporting on for some time. concern that using a cell phone for too long, too many years could potentially problematic to your health. the world health organization even weighing in on this earlier this year saying they now consider cell phone radiation the nonionizing radiation a plausible carcinogen, something that could cause cancer. at least here in san francisco, you'll see flyers like this f...