Devices don't cause much interference with these machines, same as hospitals. Doctors always have their phones on. Within about 1 metre might cause some interfe

Devices don't cause much interference with these machines, same as hospitals. Doctors always have their phones on. Within about 1 metre might cause some interference. Maybe. I heard that the reason they tell you to turn it off in flight is so that if something goes wrong people panic less. Not sure how true that is though.