When I was in the USAF back in the 80's, I worked on KC-10 avionics systems, which is just a military version of the commercial DC-10. When cell phones started becoming really popular we took one up in the cockpit and turned on all the navigation systems and had a phone conversation. Sure enough, quite a few of the gauges started acting strangely. Of course, we were in the cockpit so I don't know what kind of range there would be for such an affect, we did walk into the back and the strangeness stopped.
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