National plans to crack down on cellphone use in schools, if it wins the October election.

It would ban phones for all year groups - with some exemptions for those needing the devices for health or learning purposes.

Party Leader Christopher Luxon says it's about eliminating unnecessary disturbances and distractions. 

But social media expert Vaughan Davis told Kate Hawkesby studies show cellphone use in schools doesn't really hurt, or improve learning.

He says the accusation that they hurt academic performance doesn't really stand up.

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