It seems to me there are two issues:
1) FAA -Interference with aircraft receivers (cellphone and wi-fi)-one or two pilots RF emissions are very much less than a cabin full of devices-This is an FAA concern. Is it an actual concern?
Pilots are not using the iPad in flight for WiFi (they are probably not allowed to) and not for cell phones
They are. The charts they use to program their FMC are on their iPads, and can get updates at any time. Especially during the 28-day cycle when AIRAC data is updated. That cycle is from the FAA; Jeppesen may have a more frequent refresh rate, so that may vary. Either way, they are indeed using them.
Also, keep in mind that this is for Part 121 operations (commercial operators). GA, and Part 91 and 135 (Charter, Fractional) operators may be exempt from this. GA definitely is.
2)FCC - interference on ground cell base stations; base stations are not intended to communicate with devices above the ground (due to non-optimum base-station antenna patterns; the result may well be the cell phones try to compensate with max output power - has/is this being addressed. Is there any evidence of cell base stations near airports been overloaded due to aircraft devices?
If this is an actual aircraft receiver issue and many passengers are actually using these devices: cellphone, wifi, airplane mode, music-then some sort of report would seem to be produced. I have not seen any.
Depends.
Cell phone towers operate like TV Towers. The higher they go, the more coverage they have going down in radius from where the antenna is located. Since aircraft en route are obviously above the antenna, their signal is very limited, to nothing at all. Picture a tent. That is how coverage with TV, cell phones, and WiFi works.
As far as the instruments in the flight deck go, either they are getting theirs from GPS, or are using VOR/DME stations which operate in the reverse of TV and cell towers. Their 'tent' is upside down, and goes out a given range in radius from the station. Those operate in a different frequency range than anything else, so they wouldn't truly interfere. Same with the radios for ATC comms. Different frequencies as well.
That's what makes the FAA's policies a crock. They say that it will interfere with the flight deck. They don't even operate near the same frequencies, and even if they were on the same frequency as the VORs, VORs only report location, not transmit/receive.
Everything that we've been told from the FAA is a complete crock, because we haven't bothered to ask "WHY", and have been told to believe what they say. Now they are under scrutiny because what they are saying doesn't make sense, and hasn't for a good 15+ years.
BL.