I have now also bought the device, but at Interdiscount with a 10% voucher at a slightly lower price! BUT: Joy reigns, WIFI Calling also works at Swisscom!!! That's really cool, because I had bad mobile reception in my flat and was already using WIFI calling with my iPhone! All in all, it's a really great device, wow!!!
"WLAN calls" can be activated in the menu. Swisscom shows the Note8 as a supported device (https://www.swisscom.ch/de...). However, I have not yet been able to try this out myself.