re: WWYD?: Principal refuses to return cell phone to parent.

So, you propose teachers/administrators spend valuable time detecting disruptive phone usage, collecting the phones,arguing with the brats and then returning the phones...EACH day, because that is what will happen !
Rules, enacted at the school board level and administered at the classroom level....that's what's required to foster a decent learning environment ! Not an ongoing "policing" of the damn phones !