G'day Mate,
The cell phone thing is true, but not because it causes radio interference problems, but cell phones, if used within 3 meters of the TX, have been known to scramble the memory of TX's, any computer TX, so it can be a problem with ALL computerised Transmitters, makes no difference what frequency band they are on.
So the rule here is, NO Cells phones to be left on, within 15 meters of the pitts.
Then no problem.