Sprint Intros Intrinsically Safe Phone
An IS device has to be effectivley sealed so that a combustible mixture can't enter the body of the phone, thus igniting during internal switching, etc. Also, you'll never see an IS device that has a conductive metal exterior (a la iPhone), unless it also has a permanent grounding conductor tied to the conductive case.
It's highly unlikely that sparks emanate from a cell-phone, unless the Li-ion battery is in process of a thermal runaway, or one is plugging or unplugging the charging cable. By far the most likely source of sparks ...
Its probably something that isn't well known to the masses.
At several points in my life I have worked in areas that normal cell phones are not allowed for this reason. One of them was an oil refinery. Another was a company that did research in the aerospace industry. They take no chances in those environments and that is what something like this would be for.
In both instances, all cell phone possession or use was banned. They used approved radios or land lines within the facilities.
Probably not as much of a niche market as you might think it would be. Must be thousands of facilities that need this.
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