@flo That article references Time magazine September 2006, which cites a Dutch study supporting a ban on cell phones in hospitals . In March 2007 a study at Mayo Clinic was reported that says cell phones have no impact. I live in the U.S., and our local hospitals allow staff, visitors, and even patients to use cell phones throughout the building. There’s an unwritten rule, however, about keeping the phone more than one foot from any sensitive electronics.
One thing that’s changed in recent years is the hospital’s cooperation with cell phone providers at providing hot spots or repeaters (not sure exactly what you call them) to provide a stronger signal, which paradoxically lowers interference. This is because a phone with a weak connection must boost its power to compensate, radiating higher levels of EMI.