@Icenance : Hi Nancy, I share your predicament. If I get a penny every time I say "Please put your phone away," "no facebook, please," etc...
Instead of rewarding them for not doing what they are not supposed to be doing in the first place, I would probably do the opposite--take points off of their class participation grade for doing what they are not supposed to be doing while in class.
It is also important to set the rules on day one. Append your rules to the course syllabus and have them sign a copy for you to keep.
I am… >>>