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Hi @Rd1988, welcome to our forum!
The Xperia XZ3 supports Wi-Fi calling, but there are a few more conditions that must be fulfilled.
The setting for Wi-Fi calling can be found if you open up the Phone application > tap the three dots in the top right corner > Settings > Calls > Wi-Fi Calling. If Wi-Fi Calling isn't available, contact your network operator.
I hope that helps!
Hi again @Rd1988!
I agree with what @NunoSEN2 wrote. Get in touch with your operator and they should be able to tell you exactly which requirements that needs to be fulfilled in order for you to use Wi-Fi calling on your Xperia XZ3, but in most cases, it's a specific customization of the software. For example, the device has to be bought from the operator that offers the service so it has their customization of the software.
Keep us posted!