In reply to sutty:
Yes, and that approach is polite, as well as sensible. Our monitors are mobile-proof because they're not that sensitive anyway. General observation monitors are also fine, but those in resus / itu etc are far more fancy, and can be affected.
Thing is, it's nice that people still have some trepidation about mobiles near equipment, if only so we can say "no" if someone's having a hissy fit and the last thing we need is more hysterical people turning up!
I'm not sure what I think about phones on wards. On one hand, if I were in hospital, I'd rather use my phone than the ridiculous Patientline. On the other, if I were in and wanted peace and queit, the last thing I'd want is the patient in the next bed jabbering away 24/7!