Do you know for sure if your Note8 and your carrier actually supports WiFi calling or not? Who's your carrier and what variant of the Note8 do you have?
I've never seen or used this for myself, as WiFi calling is not used in China, because basically there's no need here.
As previous, but rephrased....
Do you know for sure if your Samsung S4 and your carrier actually supports WiFi calling or not? Who's your carrier and what variant of the S4 do you have?
Not all models and firmwares for the Galaxy S4 support Wi-Fi calling. To determine your model and firmware, see #1.3 of 29 Galaxy S4 models - know yours?
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