AT&T is Extending Support for WiFi calling to more Samsung devices as the carrier pushed out an update today for the Galaxy S6, S6 Edge Plus . The update also brings september security patches alongside WiFi calling feature.
As of 9/23/2016, the following list Samsung Galaxy devices support WiFi calling on AT&T:
Galaxy S6 Edge
Galaxy S6 Edge Plus
Galaxy S6 Active
Galaxy S7 Edge
Galaxy S7 Active
Galaxy Note 5.
How to Enable WiFi Calling on AT&T Samsung Galaxy Device:
Open the Phone app on your Samsung Galaxy
Touch MORE on the top-right corner of the screen, and select Settings from there.
Scroll down to the bottom of Phone app settings screen, you’ll see a toggle to enable WiFi calling.
Switch On WiFi calling toggle to enable it.
Make calls like you normally do.
Wondering how WiFi calling works? Check it out over at AT&T’s website for more information.