I have a ridiculously long set of class policies, to try and cover every possible permutation of student excuse. What to do when that 5th grandparent dies that quarter, and whatever.
For cellphones, I have a simple policy: put it on vibrate. If you have to answer it, please leave the classroom. If it is not on vibrate, I reserve the right to answer it.
This leads to all kinds of amusing interchanges.
This guy has another technique: