Yes, I flew a Sikorsky helicopter where the aft baggage bay smoke detector would be activated by any mobile phone left switched on, as it "polled" between cells during the flight. There was no fire extinguisher fitted in the aft baggage bay so the only safe response was to land asap and investigate. Not easy if you were IMC, or at night, especially over the sea. I used to explain to passengers the importance of switching off their phones, emphasising the exact reason for the requirement. They got the message (but obviously not by phone).