Does the phone have signal or does it always work

Small thing. If there is a national park on a state border and a wetland with nothing in it, does the phone still work out there?

A signal system would be a very cheap way to make remote areas feel remote, and it would mean the ride hailing app and the scanning app stop working exactly where you would most want them. Nothing has been said and it is the kind of detail that only shows up when you play it.