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In the country’s largest district to ban phones, students, teachers and parents reported some frustrations, but also benefits.

By Michael Levenson

A new ritual marks the end of the school day at Brooklyn Technical High School this year. When the metal doors swing open, teenagers reach into their backpacks and rip open the school-issued Velcro pouches that have kept their cellphones out of reach since they arrived in the morning.

The sound of screens coming alive with hours of notifications is sweet relief to students who are struggling to adjust to life under a new state law that forbids smartphones, smartwatches, laptops or other internet-connected devices from bell to bell.