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07/14/2004: "Position locator with GSM."

www.cellpoint.com is measuring signal travel time between up to 3 cell towers to determine approximate position of the cell phone caller. The problem with this approach is that it works well in the area that is roughly equidistant from 3 towers - this doesn't happen too often. Combining this approach across multiple Cell networks would probably produce better results (e.g. since some cell providers, like T-Mobile, allow free roaming of AT&T's GSM network).