said by fAcEtIOUs:Anyone with Google Voice can use all the Google Voice capabilities on the iPhone without the special iPhone app. All you have to do is go to the Google Voice web page with the browser on the iPhone.
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www.google.com/voiceThe app would make it easier and slicker, but it isn't needed. So AT&T can't block the free SMS capabilities of Google Voice.
I have the Palm Pre and I don't need an app(and there isn't one yet anyway) to use the Google Voice functions.
The problem is that it isn't possible to use Push, unless Google figures out some loophole.