There are cellphone bans in schools around the world. Do any of them work?

From magnetic locking pouches and blocked Wi-Fi access to outright bans and legislation, schools around the world are waging war on cellphone use. But as Canadian schools implement their own policies, experts say the research on whether the bans are effective is spotty.

There are cellphone bans in schools around the world. Do any of them work?
A student places his phone in a storage  unit hanging  over a classroom door

From magnetic locking pouches and blocked Wi-Fi access to outright bans and legislation, schools around the world are waging war on cellphone use. But as Canadian schools implement their own policies, experts say the research on whether the bans are effective is spotty.