Dummy phones. That's hilarious.
They almost deserve the win.
I dunno. Make them give up their devices and then walk them into a big room every morning and zap them with an EMP to be sure. Or maybe make them wear a shock collar connected to a sensor on their wrist with a lithium detector. Hand goes near phone battery, neck gets high voltage. Kid squeals and pisses self. Teacher laughs.
I'm so happy that I'm just barely old enough to have grow up without my life being dominated by smartphones and social media. Young enough to make use of the tech, old enough to have avoided selling my soul to it.