[ibheath]

A lot of people have their phones set up with a password, so nobody can use them without entering it. I suspect this may apply turning it off too. They should just confiscate them and not give them back at all. The kids would learn VERY, VERY fast to remember to turn off their cell phones during class.

Taking the battery off works every time.

[GovernmentShrinker]

True. Though I suspect that plenty of public skool teachers would have trouble figuring out how to do that.