I still do NOT believe this is a problem.
On the Aircraft I mentioned before, where sometimes all 3 people in the cockpit would be on mobile phones at once, there was also a normal mobile phone (well I guess not actually a mobile
) fitted to the rear wall of the cockpit and powered from the Aircraft's electrical system, and NONE of these phones ever caused any problems.
The only difference with the "fixed" phone, although always powered, was that the ringer was disabled during flight so as not to startle the Crew at a critical stage of flight.
