Sprint to support Google Voice for no extra charge, announces Nexus S 4G.

"Sprint's move to support Google Voice is a first in the wireless world and is remarkable because it cedes to Google the call-management functions that were once the sole domain of operators. Through the deal, Google will further strengthen its grip on the customer experience through the combination of its Android smartphone operating system and its Google Voice call management service...

Interestingly, Sprint will essentially forgo revenues from international calling via the deal: 'International calls placed from your handset will be placed and billed through Google Voice at Google Voice's low rates. You will need Google Voice calling credit to place those calls,' Sprint explained on its website."