I would spend long hours talking to my friends on the landline growing up. These helped form deep relationships that were pretty much (atleast for me) impossible to make in the limited amount of time you met them at school. I presume something similar happens around cellphones where you miss out on a lot of discussions and have no context for a lot of the conversations that happen the next day. They really need to be collectively banned, it’s not possible to solve this at an individual level.