Especially your coworkers. The voice mail can get it. That's what it's there for. Watch where you are going. The other day I saw a woman on a cell walk smack into a mailbox.
Dignity is one of the more precious of human attributes.
Turn off your cell phone at the movies. A lot of theaters now request that their patrons abide by this simple act of decorum. But some folks think they're above it all. Unless it's an emergency, don't talk on your cell while driving. I can't tell you how many times some oblivious wanker more concerned with whispering sweet nothings to his girlfriend than with paying attention to the road has nearly mowed me down.