pgcli was a huge help to some former colleagues who had some trouble working with relational databases and SQL for the first time. I'm a big fan myself as well. Thank you for building a great piece of software.
When I was a kid in high school in Belgium, mobile phones were definitely banned in every respectable high school without needing it to be enforced on a national level. You were allowed to carry it with you of course, but if anyone saw you using it, the teachers would take it away from you. That included during recess. I don't recall ever seeing anyone using their phone in class, except maybe some kid trying to be edgy once. It was a pretty okay system that I don't recall anyone really complaining about. Parents were happy they could contact their kids if they were worried, and it sure was nice I that I was easily able to call for help when I broke my arm while riding my bike home that one time.
Of course, this was before the rise of smartphones. Those only took off around the time I got my first job, so I can't really comment on that. I definitely do recall playing Tetris and Wolfenstein 3D on my Texas Instruments calculator though.