[discobay]

Google have released Google Maps for Mobile. You just download the free client and using your existing data plan can find and display a location. And like a car's SatNav / GPS unit can show you the way from any starting point to another (without the real-time tracking and voice). I've used it a few times whilst driving and it is brilliant and did I say it's free!

[krypton]

Just to add that v2 of this service also has virtual GPS. This means you can know your location without having a GPS; using the network information. But this service is only available in some countries. Not sure if it works in HK coz I am on UIQ and for now only S60 flavour of symbian is supported.

[discobay]

Yes that feature doesn't work on Palm Treos either. But I am still impressed with the ability to get maps and directions A to B for no more cost than my data package (which I would have to pay anyway for email and browsing).

[KnowItAll]

Not supported by the HK telcos. They seem to be using some sort of cellspotting database and perhaps picking some other info from the towers.

[krypton]

not sure what data is used but even on normal cellphones it seems you can figure out where this feature would work. A nokia (very old model) shows "3" for network name all over HK while when I am in India it shows me the tower I am connected to (the road name often).

[KnowItAll]

Many telcos will provide some extended data / info on the tower you're connected to. They use this data to guesstimate.

Take a look at cellspotting.com