A phone tells you where you are. A paper map tells you where everything else is, and on a walk that turns out to matter more.
I am not against phones on walks. Mine comes with me every time, mostly for photographs and the occasional emergency. But I have gone back to carrying a folded map, and I want to set down why before I forget.
Three reasons
It shows you the shape of the land. Contour lines are a skill, but a learnable one, and once you can read them the landscape on the page starts to look like the landscape in front of you. You can see that the path ahead drops steeply before it climbs, and plan your water accordingly.
It does not run out. No battery, no signal, no small anxious percentage in the corner of the screen.
It makes you look up. This is the real one. With a phone, I follow the blue dot and arrive having seen very little. With a map, I check where I am, fold it away, and then spend twenty minutes actually looking at things while I walk to the next landmark.
The map is not the territory, but it is a very good excuse to pay attention to the territory.
The folding, I admit, I have not mastered. I am told nobody has.