Location-based services.(Wikipedia).

Location-based services (LBS) are offered by some cell phone networks as a way to send custom advertising and other information to cell-phone subscribers based on their current location. The cell-phone service provider gets the location from a GPS chip built into the phone, or using radiolocation and trilateration based on the signal-strength of the closest cell-phone towers (for phones without GPS features). In the United Kingdom, which launched location-based services in 2003, networks do not use trilateration; LBS services use a single base station, with a 'radius' of inaccuracy, to determine a phone's location.

Some location-based services work without GPS tracking technique, instead transmitting content between devices peer-to-peer.

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