I attended high school in the US in the early 00’s and cell phones were absolutely banned from classrooms. You could keep them in your locker and use them between classes, but that was it.
I attended college in the late 00’s, and I don’t think I took a single digital exam. Quizzes, sure, but for final exams even CS was pencil and paper (or a final project, which admittedly will have issues in the post-LLM era).
I was also in high school in that time period and had a similar experience. As I recall it, pretty much every student had a phone by 2007ish (flip phones back then), and using a phone in class was grounds to have it confiscated for the day and get a detention. This was absolutely enforced.
My college experience was similar to yours as well. All exams were paper (often blue books). Having a phone out would get you kicked out of the exam hall. But by the time I did med school, it was all digital.
I was in high school in the late 2010s. No cell phones allowed during most of class time, and it was somewhat enforced. I definitely recall students being chewed out for having their phones out in class, but I also recall some students having their phones out with no repercussions.
I attended college in the late 00’s, and I don’t think I took a single digital exam. Quizzes, sure, but for final exams even CS was pencil and paper (or a final project, which admittedly will have issues in the post-LLM era).