Cell Phones as Teaching Tools

I came across this article today as I turned my computer on. It's something I've been interested in trying to incorporate into my teaching as a tool but I'm not sure how my principal would feel about it since we have a quasi-strict "no cell phones in class" rule. I can definitely see the positive and negative aspects to using cell phones to teach, but the author also make a good point about the technology today and who has access. I wonder if school district firewalls are a consideration for any of this as well.