So negative. I ride and run in the woods near me quite a bit. It's peaceful and quiet, but the opposite side of that coin is that no one would find me for quite some time if something went sideways.
I have great cell coverage there.
In my rural state the fastest connection I’ve ever had on my phone was in about as remote as you can get fishing a creek surrounded by 30’ embankments. Bet I was the only person connected to that tower.
Maybe not in the US, but hard to get to a place without coverage in Norway and often in a place without people.