Yeah, but please rely on them. An iPhone needs a working display basically to use it - and is far less “rugged” than a proper sat beacon. People tend to have their phones lying somewhere in their car, drop it when they try to get their car out of the sand, or simply forget to charge them.

There is a reason sat beacons are as rugged as they are.

(And btw, they don’t work everywhere and not at all latitudes)