Wouldn't turning off GPS, turning off WiFi and enabling "Use wireless networks" show you the tower to which you are connected? I know I am in Camp Hill and I'm usually connected to the tower at Sayford and Bartine St.
You may also want to try http://opensignalmaps.com/coverage-maps/ This doesnt appear completely accurate but may help. Driving around with google maps open and the above method will give you a better idea of where they are located.