Lately I have been getting a notification on my S9 about my "Wifi calling preferences" being updated to "optimize network experience"
I swipe it away or tap it and select "ok," but it always pops up again within a minute.
I tried silincing the notification from wifi calling, but it either wont let me or it doesn't work.
As can be seen int he screen shot below, the ability to turn of wifi calling notifications is grayed out so I cannot turn it off.
WiFi calling is a carrier installed service. Because of this I'm not sure if this will help. Open the wifi settings Advanced settings and turn off Switch to mobile data and Wi-Fi power saving mode. If it doesn't help turn them back on. I keep them off. There's one more in developmer options menu titled wifi scan throttling that's on by default. I turned that one off.
The carriers should be able to help they've probably received complaints about it by now