WiFi...

WiMAX or Cellular Broadband aka LTE or CDMA.

With my Cell Phone's GPS turned *OFF* I can still get within 20 feet or so of my position using just cellular tower triangulation. And *that is all the closer that we know they can do.

What makes you think they want people to know they can get closer using cell towers than GPS... but GPS is more widely known, so they let that ride.