“There’s such a simple solution if you are out in the wilderness by yourself. My wife bought one for me (though, at times, I think she’d rather I left it behind).”
For a small monthly fee use T-Mobile’s satellite servicewith your smart phone.
Maps, texting and exploring apps.
We were on T-Mobile, but had so many problems that we switched back to Verizon a year ago.
My iPhone has good satellite comms (text only) when it is out of range of cell towers. I use GaiaGPS and download maps before I head out to a new place. I also carry a power bank for extended power for the phone. It all works well together.