system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Why do they say not to use your phone while gas is being filled in the car?
gpt
Static charge and electromagnetic radiation (radio waves) *can* cause fuel to ignite. But your phone is not putting out a very high amount of energy at all, and the fuel pump systems these days are very well protected, so the chances of that happening are probably worse than the chances of winning the lottery.

This idea is much more serious at military bases where high-power radar poses a hazard to certain types of jet fuel.