I agree with Scruffy, but maintain that the smartphone is like a Swiss Army knife, or a versatile multi-tool. it remains in pocket or pouch until needed, When deployed, it can do wondrous deeds. As in the case of said knife, one does not carry it in plain view at all times. It is only brought out when needed for some function.
So, too, with a smartphone. These clever devices can do many remarkable things. Being in my mid-60s, I am aged enough to remember and have used manual typewriters, carbon paper, vinyl records, 8-track tapes, cassette tapes, rotary dial telephones, and even pay phones.
Back in the day, research was done in the library, maps were all on paper, directions were determined and checked using a compass and map, music was appreciated in a room on a record player, and photographs were made using film. There are many other things that the smartphone has superseded, but to go on is to further date myself...
My point is that the smartphone, properly used to support a Camino, is a tool, nothing more. Granted, it is a superbly clever tool that can bring the entire world to your fingertips. But the decision as regards when and where to use it is an entirely personal one, sort of in the vein of everyone doing their own Camino.
I will continue to carry one. On six Caminos, having the ability to locate a service or shop I needed to support my Camino outweighed any philosophical angst I might have had about carrying the smartphone. Being able to find a proper specialist doctor on the fly, locate a pharmacy, or specialty shop, etc. is beyond value when needed. The ability to communicate with anyone, anywhere at any time is similarly priceless.
Hope this helps.