Have you ever questioned a taxi fare? Wonder if the cabbie took the most effecient route? TaxiCOP is a Windows Phone app that may help ease your concerns or tell you it's time to switch cab services.
TaxiCOP will monitor your route, time, and mileage to make sure what you pay is accurate. While cab services are rather scarce in my neck of the woods, I can see it coming in handy while traveling or if cab services are part of your day to day routine.