Wifi calling option "hidden"??

A

AC Question

I have recently bought an international unlocked version of Galaxy S6. I was expecting to use wifi calling at working because I work in a concrete office, reception used to be bad with my S3, on T-Mobile. I usually got just 1 bar. However, with S6, there is no reception at all.

I used to have the Wifi Calling option on my S3, however, with this international unlocked version of S6 (model number: SM-G920F), there is no such option.

Can someone please tell me what options I have regarding enabling wifi calling? do I need to flash it with a certain ROM?

any help would be much appreciated. Thanks!
 

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