how's your sound quality when talking? I can hear people clearly, but I think there's some kind of delay maybe 2-3 secs.
I can't get txt from tmobile users. I think it's a google voice issue right now. I hope they can come up with some kind of alert for SMS. Alert thru email when I get a txt would be great for now
As for the delay, I was experiencing that as well when I was driving, but it may have something to do with the "echo cancellation" option in siphone.
As for texts from tmobile users, I had a coworker who is using an unlocked iphone 3g on tmobile send me texts and it works just fine. Strange.