Well, I know there are various apple things that calls in a crash if the phone falls on the floor board of the car (or off the roof of the car, and heck, who can blame a phone for that).
It is very common for the fire department to be looking all over for a down person or a car in a ditch on one corner near where I live, because the driver’s iPhone fell on the floor board of the car when they went around the corner too fast and they ignored it until they got home, which was well after the 911 call happened and the departments were looking for the person.
That is my only experience with these things, the way too often 911 calls associated with them that always seem to happen at very weird hours (wife of a volunteer fire fighter).