I totally agree on the distraction stand point.
i suppose with those ANCIENT dinosaur Motorola StarTac's and brick phones the batteries might have enough power to generate a spark.
but most modern phones even w/o slide off batteries, (I've dropped mine a few times and had the phone go one way, the battery another, and the cover a third..) just don't have enough power at a measly 3v to generate a spark with sufficient energy to ignite gasoline vapors. Amazingly enough, a cigarette ember doesn't either. (been explored a few times on mythbusters). however.. someone lighting a cigarette with an open flame could get ugly around vapors
I have a video somewhere of a lady gets out, starts pumping gas, and gets back in the car. .when it's done, she gets out, grabs the pump nozzle and a static electricity spark from her hand to the nozzle ignites the vapors... I'm sure that happens a lot more then people realize! It's wise advice to never get back in your car while pumping.. but in places like here in michigan.. sometimes it's just too DARN cold to stand outside waiting.. especially if you have a big truck and you are pumping 40+ gallons! so *ALWAYS* (even if you don't get back in the vehicle) touch the pump body FIRST to make sure you ground yourself before grabbing the nozzle!