@dlowan,
Yes, you can, at least here - I could use mine when I was with Diane when she was in the hospital - I just had to go to a hall by a window to an interior courtyard -
which of course a patient with bad asthma wouldn't be likely to be able to do.
Not meaning to tangent when we are all very worried about Roberta, just a comment. Maybe rules have changed here more recently, or maybe some areas in hospitals here have cell phones verboten.