This is about having the phones in their bags. Can't really scroll it in your bag. I had my phone in my bag when I was in school and it wasn't a problem. Helped if I wanted to let my parents know I would be home late. Didn't need to use it in school as much as between school and home.

Plus sometimes might choose to go to an after school club or something like that.

Wrong.

Howso? I was (non-seriously) referring to the way that the printing presses after Caxton were increasingly regulated by the English government starting in the 15th Century and reaching a high-point in the middle-16th. Fear of the wide transmission of printed materials made them do silly things like only allowing certain numbers of books before the plates had to be smashed. Remember England was a country that had prohibited printed versions of the Bible in English not long before. I'm not sure what your point about Gutenberg is.

By the 1450s, Johannes Gutenberg's movable type and printing innovations gave rise to early printed books (incunabula) such the Gutenberg Bible and the 1493 Nuremberg Chronicle, which used mass-produced books with woodcuts for illustrations.

Maybe stop spending all your time flipping pages on your book and you might get it? (Also a bit of basic historical knowledge about the history of the printing press and books would help.) Apologies if this went over your head though.