I was around the same time as you, and I think the official rules for my school were simply that you can't use them in class. Exact repercussions left up to the

I was around the same time as you, and I think the official rules for my school were simply that you can't use them in class. Exact repercussions left up to the individual teachers. Most didn't care unless it disrupted the class or was during a test, and a favorite for the class-disruption case was to answer the phone for the student and embarrass them.