When I was on the Isle of Skye, I was very surprised to see such phone boxes in very remote places. A phone box next to the street, but no houses visible. I wondered who is supposed to use them? Here, the locations for public phone boxes are chosen on the base of possible revenue or the importance of a certain location (i.e. train station, airport, …). So, you won’t find any in remote places. My advice when coming here: have your cell phone available when going to remote places or hope for other people to find you in case you have an accident or need help for another reason.
Take care!
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