One of my students was happily using his mobile today after class had started. He even smiled at me when I told him off. I guess they could
hear me in more or less the entire building after that. I'm reasonably certain he's not ever going to do that again.
What are your students going to do if and when they get a job, I wonder 
I really, really would like not to think about that ...
I've gone ballistic over the same type of thing. I don't do that often, but when I do... watch out.
Yeah, same here ...