What should cell phone policy look like in a wireless school?

This week, my class is experimenting with Voice Thread, which provides a place for people to have conversations about problems, places or topics of interest.  The issue that I would like feedback on is the issue of cell phone use in the classroom.  My school is going wireless next year and we need to change the school policy to accomodate personal devices such as cell phones and kindles.  I would like input from both teachers and students on what that policy should look like.

Here is the link to the URL:  http://voicethread.com/share/3141354/

I invite you to share your thoughts, questions, and recommendations.