I mean, I was in high school when the cell phones were largely flip phones and that one nokia brick that could probably survive being run over by a tank and at that point the rule was “nobody gives a shit if it’s in your pocket/in your bag and on silent, but if I see it or if it’s making loud disruptive noises from wherever you’ve got it it’s going in my desk until the bell rings”. That still seems a reasonable middle ground in my opinion. That way, it’s still accessible enough in the event of an actual emergency but not usable otherwise.