Smart people doing smart things. For you.

Even with Enhanced 9-1-1 service, getting the location to send assistance can be a problem.

Some smart people have been working on the problem and are trying to make it as bulletproof as possible.

RapidSOS is a startup that's trying to make sure that, no matter where you call from, if you have the tiniest bit of signal, they can send the right people to assist.

Here's a short article from the Smithsonian about the effort.

 
While I'm at it, let me plug, once more, medic alert jewelry*.  The faster we can figure out what's wrong with you, the faster we can help.  

Serious underlying medical conditions?  Allergies to foods or medicines?  Those are important things for emergency personnel to know.  Do what you can to help us help you.  And stay safe out there.