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I may have found a fix to this. I did this about an hour ago on my Note 9 and have not had the notification pop up since. You need to use nova launcher to access a mobile network settings screen that I can't seem to find in the regular settings menu (if anyone knows how to get there without it, please let us know). The easiest way is to assign access to an unused gesture input. Once you get to the menu, you will see an option for wifi calling, which may be under an "advanced" sub menu. Then select "wifi only" and you should be good to go. Here's a link to screenshots of the process:
YMMV, as I have not fully tested this for a long period of time so I don't know if it provides full functionality. But for me, so far so good with receiving and making calls and texts.
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if you go to settings-connections-wifi (actually tap on the word wifi, not the toggle)-tap the 3 dots in top right corner-advanced and then make sure the first option that says "switch to mobile data" is toggled off.
Hope this helps!
I hope this actually helps you. I know for me, I keep that option on because even though my home wifi is really fast, it can be unreliable at times and cuts out, so I want the mobile network to kick in when it's acting funny like that. But if you have reliable wifi, you don't need to have that option on.
Let me know if it works out for you! 😊
Ok, so you already tried manually setting your preferred WiFi calling method to WiFi in settings-connections-wifi calling-and then under network preference you changed it to WiFi preferred? But it keeps switching back to mobile, and the other option I mentioned didn't work as well... Hmm.. and your WiFi router has its software updated?