A ban on cellphones in New York City Schools that’s been around for almost a decade is expected to end in March. The city’s mayor, Bill de Blasio, made that announcement this week, arguing the prohibition makes it hard for schoolkids to contact their parents.

He also said it is unfair that the rule is enforced more strictly at lower-income schools where there are metal detectors.

Lifting the ban will do more than let phones back into the classroom — it will also kill a number of small businesses.

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