Question about OnePlus 8 Pro Limited (12GB)

WIFI Calling already works on my One+ 8T after the tutorial in post #2.

OnePlus is not officially represented in Switzerland and therefore access to functions such as Wi-Fi Calling and 5G, which unfortunately both require country-specific unlocks in the software, will probably continue to be blocked. However, there are instructions on forums.oneplus.com to unlock the functions until the next update. However, this will have to be repeated.

@DanielMeyer82
I agree, for such a steep price you shouldn't have to mod the phone. Unfortunately, I'm at exactly the same point as you, but with Cablecom/UPC. WiFi calling and VoLTE are not working there either.

Since the upgrade to Android 12, VoWifi no longer works.
It worked without any problems under Android 11.
Does anyone have any information on this?

Unfortunately, it's the same with Salt. I opened a ticket weeks ago but nothing happens :-(. It worked on my previous Samsung.

Does Wifi Calling work on the 8 Pro in the meantime or has the status with Sunrise not changed since June?

Something is generally wrong with the Oneplus 8 Pro at Sunrise. They haven't been able to switch on 5g for me yet either, even though everything should be right. The option is simply impossible to actually activate. I think Sunrise and Oneplus just haven't properly certified the 8 Pro for the network yet.