Where I live, barely have cell phone reception even at my S&B house. Any backwoods outings even close by will generally result in a loss of signal.
When I get to one of these areas I generally have the TC mounted on back, so immediate food & shelter are not a problem. Also, I am mostly close to home for my camping ventures. If I have a break down I can usually hike (less than 20 miles) to get a signal. Sometime I am high enough that the shorter route to get a signal will be to go up rather than down... but there is no guarantee in that unless familiar with the area.
Generally, the only other time that I am deep backwoods and out of range is when I take the TC on my hunting trips and I am always with others in terms of vehicles that we can depend others of stuck or a mechanical breakdown.
I know these situations are different from what OP describes, but it all about knowing situations, parameters and limits... and being smart about it all.
Sold the TC, previous owner of 2 NorthStar pop-ups & 2 Northstar Arrows...still have the truck:
2005 Dodge 3500 SRW, Qcab long bed, NV-6500, diesel, 4WD, Helwig, 9000XL,
Nitto 285/70/17 Terra Grapplers, Honda eu3000Is, custom overload spring perch spacers.