From Australia (the Nanny Country)
Last thursday I was flying from Albany to Perth with Skywest in a little Fokker 50.
As we taxied for T/O the flight attendant piped up and asked that everyone carrying a mobile re-check that theirs was definitely switched off as the aircraft's avionics were being affected.
Not bad. Relativley low tech. piece of kit, the F50, but I would love to know why I have never heard of this before and I fly down the back a hell of a lot
The pilots of the low tech VHF receivers of this kit were bothered by the papappapapap in their headsets. So they thought it is good time to let paxes switch the mobiles off.