I did test the Google API and it worked pretty well, I also did compare with the CellLocate by UBlox and the accuracy is fairly similar (at least in the two locations I tested in Italy). If you are interested, feel free to contact me.
I was wondering, how it is possible that any android or iOS phone can locate their phone without using the GPS and using the 3G? the accuracy for them is really good…do you have any idea what do they use to get as such accurate location?
WiFi networks. Android devices (maybe ios as well?) store and broadcast networks they see, along with a location if available. That gets stored in some freaky Google database, which can then be checked to match wifi networks to locations.
At least, that's what I thought it was. Feel free to correct me if I'm wrong though.
Applies to iOS too. Even led to curious situation - our company moved with complete IT infrastructure, including WiFi. For about a week, phones reported location of the old place when inside the building.