I definitely appreciate cell phones and am glad to have mine. I can't even imagine how much more awesome high school would have been if I lived in a world where I had my own cell phone. And it provides a lot of convenience for doctors. I was recently watching an episode of Cheers where Frasier got paged and had to go find a payphone to return the page. We're lucky.
That said, there have been dozens of times when I want to wrench the cell phone out of a patient's hand and throw it out the nearest window.
OK, I get it that you don't want to turn your phone off in the doctor's office. I don't either. Or even that you don't want to switch it to vibrate. Now that I have a phone, I feel antsy if I turn it off.
However, I would never actually answer the phone unless I honestly thought the call was a true emergency. If my children's daycare was calling, that I would have to answer. Anything else, I would ignore. However, a lot of patients don't feel that way. They often answer their phone and occasionally even have prolonged conversations right in front of me!
I don't answer my cell phone when I'm examining a patient. I feel like the least they can do is pay me the same courtesy.