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!
Smart phones: Wi-Fi geolocation (indoors 30m~). Google has an API to use this for business and IoT. GPS (outdoors 1m - 30m depending on module) Bluetooth and BLE 5.0 (<1m and directional)