As students around the United States head back to school, many are encountering a new reality: bans on their use of cellphones.Natasha Singer, a technology reporter for The New York Times, discusses the restrictions and the contentious debate they have prompted.Guest: Natasha Singer, a technology reporter for The New York Times.Background reading: 

• So far this year, at least eight states have passed laws, issued orders or adopted rules to curb phone use among students during school hours.
• This Florida school district banned cellphones. Here’s what happened.
• How has tech changed your school experience? We want to hear about it.

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