Cellular location without GPS can vary dramatically depending upon many factors. The general working guideline is 1000 feet.
High density areas with micro cells can go much smaller, and low density areas can be miles.
YES!... just make a test using and old Windows Lumia. You can track the phone even if it was formatted or having a different SIM. Just one connection to a WIFi and you can track the device.
Sadly I'm not technical enough to explain how it was working, but did it and I recovered one phone after it was stolen. Please some add this feature to modern devices. ...