AT&T released a carrier update yesterday that re-enabled this. Its called NumberSync. You can make WiFi calls via your phone number even if your phone is not nearby.
Go to Settings -> Phone -> WiFi Calling. There should be a tab under WiFi Calling settings that says something along the lines of "Add other wifi devices". You need to enter an activation code from the device into your iPhone to get it to register.
Something which should probably be made clear is that this feature depends on whether your specific carrier supports it. As of now it's only available in the US, though AT&T, Sprint, or T-Mobile.
Something which should probably be made clear is that this feature depends on whether your specific carrier supports it. As of now it's only available in the US, though AT&T, Sprint, or T-Mobile.
Go to Settings -> Phone -> WiFi Calling. There should be a tab under WiFi Calling settings that says something along the lines of "Add other wifi devices". You need to enter an activation code from the device into your iPhone to get it to register.