Sat phones, there are a few networks to choose from. I have had a number of times when sat phones have not worked or consistently dropped out while in valleys.
UHF, don't bother, good for car convoys and close proximity communication, a few km depending on terain. I have used these in search and rescue application and we almost always seem to need someone to act as a radio relay even when there are repeters in place.
Spot me or epirb would be the go, they both have their own pros and cons. Spot has the ability to send an I am ok message which would be usefull if traveling in remote areas.
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