Are phones actually spark hazards? I remember a mythbusters episode where they filled an outbuilding with dozens of different cellphones and lots and lots of o

Are phones actually spark hazards? I remember a mythbusters episode where they filled an outbuilding with dozens of different cellphones and lots and lots of open cannisters of gasoline and other petrochemicals, then called them all repeatedly without incident. https://www.youtube.com/watch?v=VjrkwxMhc4s https://www.youtube.com/watch?v=VjrkwxMhc4s I'm sure there are parts of a refinery where even static electricity could be enough to set something off but I'd assume they were not areas that people typically worked.