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In addition, if the handset is also equipped with GPS then significantly more precise location information can be then sent from the handset to the carrier.
Another approach is to use a fingerprinting-based technique, where the "signature" of the home and neighboring cells signal strengths at different points in the area of interest is recorded by war-driving and matched in real-time to determine the handset location.
Mobile phone tracking is the ascertaining of the position or location of a mobile phone, whether stationary or moving.
Localization may occur either via multilateration of radio signals between (several) cell towers of the network and the phone, or simply via GPS.
For example, it may not be possible to obtain any raw measurements from the handset directly, yet still obtain measurements via the SIM.To locate a mobile phone using multilateration of radio signals, it must emit at least the roaming signal to contact the next nearby antenna tower, but the process does not require an active call.The Global System for Mobile Communications (GSM) is based on the phone's signal strength to nearby antenna masts.This avenue has not made significant headway, due to the difficulty of convincing different manufacturers to cooperate on a common mechanism and to address the cost issue.Another difficulty would be to address the issue of foreign handsets that are roaming in the network.
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It requires the active cooperation of the mobile subscriber as well as software that must be able to handle the different operating systems of the handsets.