'Fake' GPS?

As more mobile devices add location-based services, more ways of determining users' locations are being introduced. "Fake GPS" simulates the power of the satellite-based global positioning system by other means.

Fake GPS is a general term describing the use of signals from cell phone towers or Wi-Fi hotspots to triangulate and display the position of a user of a mobile electronic device.

Fake GPS may be the only means of determining position that is built into a device, or it may be a secondary or backup source of position data used only when a true GPS satellite signal is unable to reach the user's position due to tall buildings, thick indoor walls, or other obstructions.