I can absolutely point to the exact moment my grades started going down, and it was when I started taking a phone to school. I have no clue why they're not banned outright, and in some instances in my country they provide these kids with laptops. It was of great use to me in my final school years, however it was borderline necessary to complete many of my studies on a PC. All I hear regarding these newer ones, is that they're constantly subverting the schools lockdowns of the devices to play Fortnite etc. I remember pulling the exact same shit when Minecraft came out, and we were already making a mess of the library with CS1.6