This probably has more to do with the fact that 30 years ago if you brought an electronic device into school it was probably relatively cheap and there was a de

This probably has more to do with the fact that 30 years ago if you brought an electronic device into school it was probably relatively cheap and there was a decent chance your parents didn't even know about it. And either way it wasn't really a necessary part of your existence. Now it's a $1200 phone that is most likely the primary way your parents communicate with you between the time you're out of school (around 2:30 or 3 when I was in, unless there were after school activities) and they return from work.