The cell phone and your cheek

How often do you wash your cell phone? And yet every day - sometimes several times per day you clinch it to your cheek. We already have soft rubbery cell phone sleeves out there. All that needs to be done is an impregnation of these phone covers with silver. This has already been done for stethoscope diaphragms. Now, who do I call to set up an infomercial? ;-)