When i was around 13 the local news did a story about a school system BBS, and I happened to have a pen in hand when it flashed the number on the screen briefly, and it turned out to be a dedicated line for teachers. The thing is teachers never actually used it and there was a very active community of kids that dialed in on their own number. They were on a time limit though and I eventually shared the teacher line with a lot of them so we could chat 24-7. It was one of the few multiline BBS’s at the time so it ended up being kind of an HQ for people trading pirated software and stuff after the number spread around. I don’t think school staff ever looked at it.