tethering? I used to do it with my Nokia e65i I had with Voce (3rd party wireless provider) and was pretty decent, but the best part was connecting through bluetooh
When I got the iPhone, it doesnt allow you to connect, unless you do some hack, and i dont want to go that path for some shitty AT&T network.
Rather, I just use the MiFi from Verizon... its great