I'm a little older than you (mid forties), and back in my day (when we walked to school uphill, both ways, in the snow, with no shoes), they banned pagers. (And the penalties could be pretty bad, since "only drug dealers have pagers".)

(The thing that annoyed teachers was when we played games on our graphing calculators, which they of course couldn't ban, since the school required them in the first place!)