CEO John Legere’s company, T-Mobile, was the only carrier in the nation to offer first-party Wi-Fi calling— until now.
Internal training documents reveal that Spring will be joining T-Mobile with its own offering, beginning on two Samsung devices, the Galaxy Mega and the Galaxy S4. The Wi-Fi calling will be enabled through maintenance updates.
This is all still unconfirmed, but Sprint should be announcing the news soon.
Wi-Fi calls don’t count against your minutes— if you have a compatible device (for now, the two listed above), then you’ll have to enable the feature online. There will also be a toggle setting on compatible Sprint Android phones in the future with the update. Another key note is that you’ll have to have Android Location Services enabled on your device to make calls over Wi-Fi.
Source: Android Central