That's one of my pet peeves too. If you are in a public space, your cell phone call should be short and to the point. "Sorry, I got held up at work and didn't get to the gym until now. Is it okay if I come home in an hour? Love you! Bye!" = acceptable. "I'm on the train to NY and will be downtown around 7" = acceptable. Long, loud chats about your personal business are not welcome. Long inebriated and unfiltered chats are very, very unwelcome. It's soooo inconsiderate. And if you are having an intense convo on a cell phone while in a toilet stall, your name had better be Barack Obama (or similar), because I can't think that many people have phone business that absolutely cannot wait a few minutes. I'll make an exception for calling 911 because you are having a medical crisis. Other than that...master the phrase "I'll call you back!"