Thanks, good start. I've been off polishing up my "rule" but it turned out more like a rant. I've written this in my head so many times:

PHONES
The sign says “Cell phone use only in entrance area.” That means you honey. We don’t want to hear the details of your life since you last talked to your friend on the drive to the gym five minutes ago, or how you stood up boring Grandma for Thanksgiving dinner to meet up with a cute guy you’d met at the bar, or how the witch at work actually wanted you to WORK, for Pete’s sake. We don’t want to listen to it ringringringring in the locker either. Get a life and lose the phone.
P.S. After you left, we spontaneously voted that Grandma should cut you out of the will.