T-Mobile has been evaluating and deploying that technology since early 2006, I would be surprised if Google developed this technology themselves. I was part of

T-Mobile has been evaluating and deploying that technology since early 2006, I would be surprised if Google developed this technology themselves. I was part of an early Beta for T-Mobile using Nokia flip phones that would work over a regular WiFi router. Part of the testing involved originating calls on WiFi and then transitioning to Cellular and vice versa.