[tlrobinson]

When the iPhone came out I had a great idea to actually implement this... unfortunately there were too many road blocks, the main one being that the carriers don't tell you where the cell towers are. http://tlrobinson.net/blog/?p=24

A company called Navizon ( http://www.navizon.com/ ) has such a product, and they rely on users to wardrive for WiFi and cell towers.

[asmosoinio]

So it is a database lookup system based on some kind of tower id?

I was just wondering about that. It would really make sense if the GSM/CDMA standards had the tower pass their position to the cellphones, but I guess that was not something the people designing the systems had in mind back in the days.