For crying out loud... they determined that mobile phones inside aircraft could cause nodes of radiated energy strong enough to break through the shielding of the aircraft systems.
I have no idea how they solve it with cell networks onboard. One fact is that the phones will never have to transmit at their maximum energy levels that way, as they would trying to reach a ground station from FL330 through the hull.
Fly-by-wire or tubes and fabric... both will have the risk of having an accident increase by a factor of eight, or if it was twelve, if a cellphone disturbs the ILS receiver so that the crew fly an NDB approach instead.
"I have my mobile on all the time and it never causes anything". Wrongo. You never observe anything it causes. Big difference.
Regards,
Fred