I agree that while there is spotty cell service in a lot of areas, this is not a time when I would be a cell phone luddite. It would worry me no end to not hear from DH if he was doing this type of trip. He used to travel a lot, weekly, before cell phones, and even though he wasn't anywhere "dangerous" or isolated, he called every night. Now, if he doesn't call, he will text me or we Skype, especially when he is overseas. He is getting ready to go to India and Japan for 10 days the week after next, and the time differences will make it difficult to communicate, but a quick text at least lets me know he's alive.
Perhaps he could ask to use the land line in the office of some of these lodges/hotels to call you.
I used to be a luddite regarding the use of my cell phone, but, since I got my I Phone, I use it tons. It's all related to my work, though. When I was teaching, obviously, I couldn't sit and talk on the phone, although once or twice DS called me from Iraq and I did speak to him in the classroom. But now, clients call me when they have to change an appt. or the secretary calls me if they call in to the main number. I also am constantly calling my voice mail at the office. Other providers whom I collaborate with call and text me all of the time; it's really the best way to reach me, as I am in the car driving to clients all day, in session, or working from home 2 days a week. I hesitated giving my phone number to clients, but absolutely no one has abused it; some still call my voice mail at my office number, but they know there might be a longer time before I return the call. This has definitely made my job easier. On the other hand, I hardly ever use my phone to talk to friends. I wait until I get home and use my, gasp, land line.
You can be sure I always have my phone with me when cycling. I have had to use it, especially when leading rides and I am sweeping and I come upon someone with a mechanical or other issue. I can call DH and then we decide what to do.
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport