Explanation for Wi-Fi Calling - Xperia Z3 Q&A, Help & Troubleshooting

Hello,
I would like to have some explanation on how Wi-Fi calling is enabled on the d6603. My mobile operator (Salt Switzerland), has wi-fi calling service enabled, but on my d6603 there's not wi-fi calling option. For what I know, there are some operator, like T-Mobile, that enabled wi-fi calling on the d6603, so the phone is capable of using this feature.
My question is: wi-fi calling is an option of Android that should be enabled by rooting the phone, or is an option int the manufacturer's software?
Thanks
Edika

Today I've got some explanation from my carrier about WiFi calling. They say that they not sell any branded phone and at the moment the phones that support WiFi calling are iPhone 6 and Samsung s5 and S6 that have built in WiFi calling enabled, but they was not able to answer my above question.
So again: if someone can answer my question and explain me better if the WiFi calling is an android feature or is a special feature added by the carrier.
thanks
Edika
Inviato dal mio SGP521 utilizzando Tapatalk

WiFi calling must be supported by both the carrier and the device. It is possible to use a phone that isn't supported by the carrier for wifi calling. For example i had a LG g2 at&t model on t-mobile which did not have wifi calling but the hardware supported it. I ported the wifi calling software from the t-mobile variant and it worked perfectly

So If I install the T-Mobile version of the Z3 software I will have wi-fi calling? Did you know where I can find this software?
Thanks

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Yes, I did.
How is It possible ?
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Experia 5 ii wifi calling support on US Variant.

Hi,
Is wi-fi calling supported on XQ-AS62, US Variant of this phone ? If so, which networks. I am specifically interested if the feature works on Tmobile or a Tmobile MVNO.
I see contradictory information on the forums and hope someone who owns the phone can give a definitive answer.
ds592 said:
Hi,
Is wi-fi calling supported on XQ-AS62, US Variant of this phone ? If so, which networks. I am specifically interested if the feature works on Tmobile or a Tmobile MVNO.
I see contradictory information on the forums and hope someone who owns the phone can give a definitive answer.
Click to expand...
Click to collapse
As mentioned on other thread:
"Nope, I am using T-Mobile and Wi-Fi calling is not supported(no option in settings), even *#*#4636#*#* menu shows Wifi Calling Provisioned toggle disabled and Off (VoLTE Provisioned is disabled and On)"
I did some research and there is no definitive answer to why Wifi Calling doesn't work with T-Mobile but I suspect it has something to do with Certification from T-Mobile, Sony and T-Mobile should work like they did for VoLTE to enable Wifi Calling. (Not sure if rooting and adding some config will change this but out of Box Wifi Calling is not working with T-Mobile)
Thanks for the information. I assumed the North American variant meant it would support all network features of US carriers.
I see Sony Experia phones in the past that did support wi-fi calling on Tmobile, so its surprising they have dropped the support on their flagship phones.

Enable Wifi calling on a carrier (Airtel India) that doesn't list HTC U11+ among supported devices?

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I have a rooted HTC U11+ with me. My carrier Airtel India, has Wifi calling, but doesn't list HTC phones among supported devices. Is there a way to change the settings, to enable Wifi calling on this carrier?
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