Well, I knew it. I knew you could be on your mobile phone within a hospital and it not interfere with anything. And this study shows so too! Well it's an American based study but i'm sure the way their phones work is the same as ours ... surely.
Though saying that, they did have a similar news article on the BBC News website. Can't remember the link to it though. My theory still stands though, that you get the best signal on your mobile phone when you're in a hospital.