Which bit about refueling? If it's the myth about cellphones triggering explosions, then I'd have to ask why tarmac radios at several more watts and considerably less distance don't get pinged. Besides, in my experience most tarmac fuel trucks seem to come equipped with a very handy cellphone and a radio ... and there's nothing special about the phone, just a regular old Nokia.
Mobile phones are not a fire or explosion hazard to petrol stations or aircraft refueling.
Anyone seen the show myth busters. The looked at this particular issue and tried the best they good to blow up petrol etc., and came to the conclusion it's a myth.
Heres on FACT though - in Australia, its against the law to disobey the requests of airline staff (under the CAO's/CAR's) - do you need any more reason than that to turn it off when asked to do so?