Half these routes run well out of phone range. None of this is alarmist — it's just the stuff worth sorting before you leave.
The Australian Triple Zero app — gives the 000 operator your exact GPS coordinates. Free. Install it before you ride.
Built into iPhone 14+ and Pixel 7+ — it can call for help if you come off and can't. Turn it on in settings.
Roadside assistance. Save the number before you leave mobile range.
For genuinely remote routes, a Garmin inReach or SPOT will get a message out where phones can't.