The following message was gleaned from rec.autos.misc
I guess that's why they call it "misc"
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Subject: Re: Cell ph> Just wondering, many cell phones (and pagers) have a "silent ringer"
which creates vibrations using a very small DC motor with an offset
> weight on the motor shaft. Since a brushed DC motor has a commutator
> that may create a spark while it rotates, could *that* be the cause of
> those (apparently) cell phone related gasoline explosions? Perhaps the
> person received a call while the phone was on vibrate mode while > pumping gas....
The only fuel explosion that I know of while using a phone was with a VW bug. Which are reputed to blow up all by themselves anyway. The phone was just a co-incedence.
I think it was more mass media paranoia than anything else. Like cell phones cause brain cancer.