By Laila Kearney NEW YORK (Reuters) - New York City Mayor Bill de Blasio's teenage son, who helped his father's election campaign with a sentimental commercial, may now be influencing his dad to move forward with a new policy for cellphone use in the city's public schools. While de Blasio ran for mayor on a promise to allow students to carry cell phones to school, after parents complained of not being able to reach their children and of kids scrambling to find places to store their phones, the policy remains in place almost nine months after he took office. ...

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