Question about OnePlus Nord (8GB)

It does not work with Salt and is not planned as of 15.07.2021.

with sunrise it has been possible since the beginning of june.

I am with Swisscom and in the device there is no option for Wifi calling under the Wifi settings.
I can't tell if it's the provider or the device.

yes, that would also interest me. has anyone had any experience with sunrise? according to their faq, the 8 and 7 series work...
thanks in advance for the answers.