No Cell Phone Usage Poster

I have been contacted by the Admin Manager James Kostal who requested some work from my computer arts classes.

Specs:
Create a "No Cell Phone Usage" poster which will be placed on the outside doors of the restrooms and locker rooms.
No color limit.
Doesn't want the cliche red slash through a cell phone sign. (e.g. No smoking sign)

Be creative and may the force be with you.