This is great in theory, but how does an app tell the difference between your phone being in a car involved in an accident, against your phone being dropped on the floor?
It's probably very accurate in high-speed accidents, or if the car hits a stationary object like a tree, or wall at speed. But what about if you're going relatively slow and break suddenly - causing your phone to slide off the chair and on to the floor? You've avoided the accident, and are safe, but your phones motion sensors probably tell a different story.
The problem is that even a few occasions of false reporting by the app would see it trusted less and possibly ignored by those supposed to respond - not to mention the worry of those on your contact list if there was no accident.
To clarify in more detail maybe we need to try to learn more details about this application, those who have already made the application have already tested it and are worth publishing so it is useful for the crowded community, thank you