Please tell us some basic information before asking for help:
Model Name: ROG 6
Firmware Version: 32.2810.2209.197
Rooted or not: not
Frequency of Occurrence: always
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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No wifi calling available for my ROG 6, I had switched my SIM card to my Samsung and it's working fine.
(Malaysia market & Yes Telco)