In the wake of the Leiby Kletzky tragedy, some parents are asking Mayor Bloomberg to lift the ban on cell phones in public school, so they can keep track of their children. Students have been forbidden from bringing cell phones into school since a Department of Education ban began in 2006. The mayor, on his weekly radio program, recently voiced some support for helping parents know their children’s whereabouts through smart phones, but his spokesman, Stu Loeser, said the mayor will not reverse the ban, as cell phones are a classroom distraction. Mona Davids, president of the New York City Parents Union, believes that the mayor has no authority on the issue as it involves safety. The City Council voted in 2006 to lift the ban, which was also opposed by the Teachers Union, but Mayor Bloomberg vetoed the bill.