Can you get wi-fi calling on a Samsung Gigaset? I am in UK on the 3 network - not sure if that makes any difference.
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Samsung or Gigaset ?
For a question like this it is great to give full /e/ version like this.
About phone > tap Android version > long press on /e/ version > copy to clipboard.
Oh, the Gigaset is not Samsung!!
Phone model GS290
Android 10
/e/ ver: e_GS290-userdebug 10 QQ3A.200805.001 eng.root.20210422.212722 dev-keys,stable-release