I seen an interesting experiment on myth busters on the good old discovery channel.
They proved that the actual mobile is as safe as anything, and contrary to the myth
it was the spark from static that was causing the infernos...
It was happening to more women than men,
and what they found was that the women were more lightly to sit back in the car whilest waiting for the petrol to fill up.
Note : In the states they can set the limit and lock the fuel flow on.
So whilst waiting there nylon or synthetic clothes would rub on the seats, same for the men,
but when the man got out the car again he would grab the top of the door and discharge the static.
where as the woman would not touch any metal,
they would either leave the door open or not touch any metal.
So when they grab the fuel pump "Static" Spark and woosh