> B J Foster said the following on 11/09/2008 8:49 PM:

>> I have a feeling that the CPUs within the devices actually cause more
>> interference but paradoxically, pilots allow people to use PDAs in
>> "flight mode" (which is RF off, CPU on).

>
> I flew on South African a few months back and they instructed us to turn
> all mobiles off during the flight and not to use "flight mode". I don't
> know the reason for this.