Should Cellphones will be banned in Buffalo classrooms

What do you think about classrooms not having phones in them. I think the kids would be less distracted and will be able to focus more. The only issue I have what if something tragic happens and the kids have no phones to contact anyone.

But in Canada the game is about to change with  officials across the border are planning to announce this week that cellphones will be banned in classrooms.The rule would take effect for the 2019-20 school year and it would prohibit cellphone use during instructional time.

Some schools already have similar policies in place. What do you think?