Uh, they would use the cell phone to target your location, not to use the cell phone as a weapon.

somebody is doing something remotely to cause the run away Toyotas?

Actually, I'm wondering if this could be a way to remotely
shut-off the engines of runaway Toyotas. If you recall
in the recent case, the driver didn't seem to know or
was afraid to shift to neutral or turn off the engine
until a patrolman came to the rescue.

Now we'll have to re-think the idea.

No we won't. It's a passive device, and can't be activated to do anything except emit its ID when scanned.

The Exploding Pet Threat(TM), new from Al Qaeda!

"If they fear their pets exploding, we have already won."

But what if it's the pets themselves who are the terrorists? What if our pets revolt by becoming suicide implant bombers? "Well, hello there, li'l pup! Aren't you a nice doggy? Would you like a tre-" BOOM! Although I can see how the cats and the dogs would be diverted from us to use this technology to exterminate one another. Puts a whole new spin on those penguins in Tim Burton's second Batman movie, too, whenever it gets remade.

Sorry, long day. my brain is wandering behind the little animals.

They're not using that technology ever.

Andy, I would 'never' say 'ever'!

It's thinking as this that makes it possible.

Twenty years ago would you have believed that people's locations could be tracked while driving their cars or tracked while carrying their cell phones?