One more reason for me to stay true to my old Nokia from 1999. No GPS, no MMS, no MP3, just a regular old phone. It's also big enough to handle unlike the baby phones of today!
The "triangulation" some speak of is not very precise at all. The signal strength depends not only on the distance from the station, but on what's in between, hills, houses, such things. It'd be a right pain to take all that into account and really pinpoint the location. Even if it could be done, I wouldn't worry too much, because I have nothing to be ashamed of.