Setting up WiFi Calling service on Honor 8X

I recently purchased Huawei Honor 8X on Amazon
The exact model is JSN-L22 (Global)
What does 'Global' mean?
I miss many settings and features on this model which do exist on other model (like the European one).
For example I can't find on this device how to enable/activate the WiFi Calling feature
Anyone can help?
My carrier is Cricket which is sub-carrier of AT&T (it means that I use the AT&T towers)

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