Just type this into the googles: How accurate is cell phone location data.
"By using cell tower triangulation (3 towers), it is possible to determine a phone location to within an area of about ¾ square mile."
Whatever you do people, stop using your phone to navigate through the city!
Accurate to the point of 5G becoming real time. Where simply moving from one grid to the next has triangulated you, your device has been identified in it. Who has that data becomes the question, what does it take to acquire it. Harder where there isn't coverage, the lag, until they're fitting it everywhere, or trying too. Wait for the EVs. But the grid can pinpoint your location, moving from one to the next. You're a beacon through most devices, and depending on what they're using, has full building layouts, upto the point of optics.