Disprove of the ban without using yours in class. Duh.
Me? This is tricky. I'd rather something like extreme penalties for allowing it to be a distraction. Also, parents are buying these for their kids, but not telling them how to properly handle this new tool (since that's what it really is). Cellphone education and dire penalties for infractions. Y'know, like automobiles, another tool that is also a little too accessible in this country. Allow the schools to determine the penalties and offenses.