I commented in my introduction post that I think that the time has come for a "rule" to manage cell phone use in class. Perhaps something like, "Use cellphones only during breaks." The accompanying gesture might be the thumb-little finger phone sign while rotating the wrist back and forth.
The problem seems more with texting than anything else. After being warned once or twice, my students have learned to set their phones to vibrate mode.
In China, where I have taught summer pronunciation workshops for university students and English teachers, dealing with this without being too heavy-handed has been a problem. (To make things even more complicated, Chinese-English dictionaries are often an option for cell phones there.)
I would appreciate any comments and suggestions regarding how you manage cell phones in your (particularly HS or college) classes.
Dan Davidson