While I agree with Rowuk (and others), there is another side to it. As a freelancer, I have no "real" (steady) job. When the phone rings, I answer it and hope to get work. It's far from ideal but that's the way it is. Though I'd love to leave my phone off or at home, it's just not an option. What I DO do is leave it on vibrate almost 100% of the time. That's just a matter of being considerate.