Hi @LotusExcel!
The Xperia X supports Wi-Fi calling, but there are some other requirements that will need to be met for you to be able to use this service.
- your operator and subscription (incl. SIM card) must support Wi-Fi Calling for the device model you're using.
- depending on operator, your phone must sometimes be operator-branded and/or use operator-customised system software.
- your phone must be in range of a Wi-Fi network.
The setting for Wi-Fi calling can be found if you open up the application called "Phone" > Tap the menu button (three vertical dots) > Settings > Calls > Wi-Fi Calling. If the option is not available here, get in touch with your operator for more information.
I hope that helps!
