generator - i agree with you 100%. there is nothing more annoying in class, where phones are prohibited altogether, than being distracted by a vibrating table. and i hate it when people decide they will take their phone out and message someone during a lesson, i don't know why, and it shouldn't but it distracts me until they put the phone away. i decided to add my air head comment as people on the page before were saying there is no reason to leave it on.
anyway, for people who do want to leave it on - make a profile in your phone called UNI. no noise, no vibrating alert, nothing, and turn that on before the lectures.