Originally Posted by
Uplinker
We are not allowed to use our cellphones at petrol stations, and they are much lower power devices.
The reason mobile phones use is not allowed on petrol forecourts is actually nothing to do with the RF signal which as you say is low power and poses no risk. The main potential hazard is if someone were to drop the phone while filling up their vehicle it could break and the battery could cause a spark, petrol vapour is heavier than air so if there is any accumulation of vapour it will be close to the ground just where any spark from a dropped device might occur.