I was really wondering what kind of satellite-based emergency SOS they were using -- mostly because I'd never heard of it until it was being shipped in a commercial product, which is something very rare to see.

So basically, they have their own infrastructure for their own proprietary 911 service with global coverage? It's really amazing that we live in a world where we can have such infrastructure, but at the same time, it's owned and controlled by a single corporation.

I notice there's multiple mentions of these satellites working with the "Find My" service, which keeps track of where a device is (in order to find it where it's lost). So I guess all this infrastructure also allows Apple to pinpoint down any user worldwide -- even if they're off-grid.