Earlier today at its Worldwide Developer Conference keynote address, Apple displayed a slide from its presentation listing many under-the-radar features and improvements the company has made to iOS 8. One of them was Wi-Fi calling, which allows users to make regular phone calls over Wi-Fi rather than a cellular network.
Wi-Fi calling allows networks to ease strain on bandwidth and potentially speed up the network for other things. It also allows users to experience higher quality calls when carrier signal is low and may drain less battery life during calls.One of the best things about T-Mobile Wi-Fi Calling is that it's so simple to use. You don't need to activate anything or download a special app. Just connect to any available Wi-Fi network, check that Wi-Fi Calling is turned on on your capable smartphone, and make a call (or send a text, email, etc.) as you normally would. That's it.
iOS 8 is available to developers now and launches for the public in the fall.
Article Link: T-Mobile Says It Will Support Wi-Fi Calling for iPhones Running iOS 8