You may also be able toenable Wi-Fi calling on other Android phones.
The first is in your phone’s tweaks app.
check that you’re connected to a Wi-Fi internet.

Open your phone’s controls, and then tapConnections.
Tap the switch next toWi-Fi Calling.
From your phone’s home screen, tapPhone.

Tap theMenuorMoreicon to launch the prefs.
Some phones have their options available directly on the main app screen.
What Is Wi-Fi Calling?
Wi-Fi calling will use your wireless web link to make phone calls rather than your phone web link.
There aren’t a lot of reasons to avoid Wi-Fi calling, but a few issues can spring up.
In addition, if your wireless connection is weak, you’re more likely to drop a call.
Wi-Fi calling generally needs a strong signal to be effective.
The data used won’t be much more than a Skype voice chat.
It shouldn’t be an issue unless you use it a lot or have a very small data cap.