I'm not sure. Hopefully it's possible. I can identify the tower that I'm connected to through my knowledge of tower locations plus the dBm reading on my phone. For example, my phone will prefer a -97dBm signal at home over a -72dBm signal. On the rare occasion I see the reading in the -70s, I know I'm connected to my closest tower. And when I see the usual reading of -97, I know I'm connected to the better quality, but slightly further away tower. I can also tell by data speeds. The -97 tower gives me usual speeds of 0.90Mbps to 1.6Mbps. The -70 tower gives me usual speeds of 0.03Mbps and pings of about 1100. Obviously these aren't the best ways, but they work well for me, especially because I go to the same places every day.
Also becoming a Sponsor helps, as you can see where every Sprint cell site is, as well as the NV Completed sites. More info on that here: http://s4gru.com/index.php?/topic/1195-information-about-s4gru-sponsorship-levels-and-how-to-become-a-sponsor/