Hi Don. One answer is a satellite phone but huge bux for the rental and usage fees will kill most folks if it's just about having a phone. Fact is...up north, cel service is still poor. It is improving but the small numbers of users don't really justify the expense of putting in the relays.
Yes, a ham radio might do it, but I doubt very much of the repeater coverage is worth the cost of getting the set-up. I use a VHF and if off in the weeds, probably I could get a call out for help, but I couldn't stake my life on it. I have to be prepared to look after myself if I am off the grid.
Gary Haupt