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In fact the telephone operators already offer a rough localization service which is used by the police for example to track lost persons or criminals. It uses the signal strength of the mobile phone as it is received at the different basestations it surrounds, and uses triangulation for calculating the position. Unfortunately the accuracy is quite bad, and GPS outperforms this method tremendously.
Note that WLAN also has a similar locationing system where the basestations are access points. Again the accuracy is low.
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