T-Mobile recently just announced that they now have wifi calling on some of their devices including some android handsets.
T-Mobile Extends Wi-Fi Calling to Android Smartpho... - T-Mobile Community
Is there a hack that would allow us to make it work for our Optimus S on Sprint's network?
T-Mobile Extends Wi-Fi Calling to Android Smartpho... - T-Mobile Community
Is there a hack that would allow us to make it work for our Optimus S on Sprint's network?