You sort of missed my point. If I'm in the car at the curb, waiting for my kid, then using jamming means I am unreachable by phone - meaning I have to find a parking spot, go inside, get the office to track down my kid, etc., which disrupts the work of several office workers as well as the class (when the student is pulled out). It would be much less disruptive if we could just use our phones - I text my kid, who quietly ducks out of the room (having told the teacher before class that she'd be leaving).
And where in the U.S. can a child leave class without having to get the office workers involved? Everywhere I've heard of, you need at least two forms filled out before you can leave with your child.
the enemy's gate is left, right?
No. The enemy's gate is down.
4, Informative. Only here, folks.
He has not acquired a fortune; the fortune has acquired him. -- Bion