I think the "no cellphones" rule is about minimizing distractions during critical phases of flight, not because a phone's radio is going to do damage to the aircraft. So a phone on but sitting in someone's bag is not the end of the world.
> the "no cellphones" rule is about minimizing distractions during critical phases of flight, not because a phone's radio is going to do damage to the aircraft
The cell-phone "ban was put in place because of potential interference to wireless networks on the ground" [1]. The distraction argument started making its rounds after the interference hypothesis was debunked.
Aircraft electronics were also a commonly given reason for a time. And as for distracted ions there was a period when you could read a physical book but not a Kindle.
No distraction? Do you need sub 500ms response time? I'm pretty sure that even someone watching a movie with noise canceling earphones was aware of an issue just because of physics…