Emergency Number Dialing....
I think you hit the nail right on the head in your last post, as that is exactly what I was thinking when I read your first post last night. This would be PERFECT for an emergency number should the unfortunate need arise. I would package it up, with a simple README and button code to do just that, dial an emergency number.
It could be triggered by however the user wants, an airbag sensor, manual button on the screen, or like someone else was talking about a few days ago, some sort of shock sensor / collision sensor. If it was used to dial say 911, then in the event you were incapacitated and could not use your phone, it would be possible to trace / triangulate the call, or even for the call center to possible monitor the phone.