Will native Google Voice integration work with the Sprint iPhone 4 and 4S?

There appear to be no technical limitations that would prevent the iPhone from being compatible with Sprint's implementation of Google Voice integration. That said, there could be political or policy issues that would preclude Sprint from provisioning iPhone accounts to integrate with Google Voice.  This may especially be true if Google Voice requires certain specific packages from the carrier that aren't available to iPhone users; it's not uncommon on various carriers for iPhone users to have a more limited set of packages to choose from, or not receive all of the usual benefits of the iPhone when choosing a non-iPhone-specific package. Update (Oct 24, 2011): Apple has published a support article that notes that users with Google Voice integration enabled may encounter problems with registration of their phone number for iMessage or FaceTime. See http://support.apple.com/kb/TS4091: Integrating your Sprint account with Google Voice may prevent your mobile phone number from being registered for use with FaceTime video calls and iMessage text messages. This occurs only when your Sprint phone number and Google Voice number are not the same. It should not affect your ability to send or receive SMS or MMS messages, or to receive or place FaceTime calls or iMessages using an email address instead of your phone number.

With Sprints GV integration, the phone knows nothing of Google Voice. Sprint just changes the caller ID and SMS from ID for outgoing calls/texts. Also it sends all incoming sms/calls to the phone like it would a regular call/sms. I see no reason that Siri would be affected

It works for me on the . I transferred my line from a which was previously activated for and it worked right away when I picked up the 4S this morning and activated in-store.

Works well with one BIG caveat.  Unfortunately sending/receiving texts to/from SMS short codes will not work as the receiving party will see the message as being from GV not from the sprint number.  GV doesn't support short codes.  So any type of SMS banking, SMS search, etc will not work.

Integration works great for me on my new 4S! I figured there would be a brief delay on Sprint's end after adding it to GV, but it happened immediately.

My suspicion: Yes, but probably not in the same way that it works on an android phone (which "takes over" the phone via the app). Sprint has a more network based (vs. client side) approach which allows users to swap their sprint number for their google voice number and vice versa so that you have one integrated cloud-based system.  Where the rubber will meet the road is on international calling.  Sprint loses out on ILDT revenue by giving this up to Google.

Sprint does this with Blackberries and Dumbphones so why not iPhone.  It is OS agnostic.  That said, Apple could drop the hammer.

The BIG caveat is that when you receive text messages via the iPhone app, they don't show up on your Google Voice account.  My favorite part about using Sprint integration with Android is that whenever I send a message it always shows up on my computer as well. Making everything seamless and able to be referenced..