Yes. They do this using an interesting workaround that
is explained here - sort of.
Umm...I can't reply to an SMS with an email on my iPhone. Is that a new feature on the 3G models? OR are you talking about entering a SMS email address to reply? Not necessary. Or you can set up GV to
deliver all SMS messages via email, and reply to them via email.
To initiate a SMS from your iPhone via GV you have two choices...only one of which is currently available to you. Those that got in under the wire have an iPhone app that manages your Google Voice voicemail and SMS, but Apple pulled them from the app store a few weeks ago. Or you can go to this website from your phone:
https://www.google.com/voice/m/sms It actually isn't too bad. Or if you have saved a SMS conversation from a recipient you can go back to it, initiate another message to the 406-area-code number that was assigned to their last message, and just send another one (hope that makes sense
)