I don't want this discussion to devolve into an FAA radio interference flame war but the risk from general consumer electronic/mobile devices on airplanes has been minimal and most instruments are well shielded against RF interference.
I would suspect most seasoned and knowledgeable pilots don't worry too much about Mr Businessman in first class on his iPhone or Tablet using 5G.
On the other hand I have seen more than one flight attendant absolutely lose their marbles because someone was texting during announcements or while taxiing.
Aside from the fact that someone talking on their phone during a flight would be terribly annoying, the biggest issue with active phones on airplanes was how it messed with ground cell towers. There was fair amount of handoff the towers had to do with traveling passengers at 30,000 feet. At least in the earlier days it was problematic to deal with. I'd love a wireless communications engineer to chime in on that part.