Both my T and pdoc have their phones on vibrate, usually not on their person, but set aside on their desk or somewhere. They may glance at it, but usually don't answer it. The exception has been for my T when there was a family medical emergency going on (I was aware of it at the time), and my pdoc will answer if it is an emergency call from the hospital (he is the director of the psych unit). None of the above has ever bothered me. I never have found it intrusive or unprofessional. I don't get too bothered about that kind of thing as long as it is unobtrusive and handled with professionalism.