Voice over LTE/Wi-Fi Calling on ROG Phone 2

[Watchers]

Can anyone explain why voice over LTE isn't enabled by default on this phone? Or even Wi-fi calling? I live in an area where the 3G signal is pretty low and I miss about 90% of my calls. I found a code on XDA where I can enable the setting, but it disappears after a reboot. I've attached a screenshot that shows the setting that's enabled after the code is entered. It's the "Enhanced 4G LTE Mode" Also, the Wi-Fi calling and Carrier video calling gets enabled as well. I even have a T-mobile micro tower sitting on my desk and I still miss calls.

[#2]

what about the carrier video calling option which the device says you need to download google dialer app for that?

[Melqui]

Please @Anders_ASUS @CH_ASUS enable VoLTE for TIM Brazil
With this code VoLTE works normally with TIM Brazil, please enable officially!
*#*#3642623344#*#*

[Watchers]

And the coup de grâce for this phone, with the 3G shutoff at the end of the year, this phone will no longer be viable. A $900, year old phone will be a nothing more than a wi-fi enabled gaming device.
I reached out the T-mobile support via Twitter and was told there's nothing that could be done and I was basically SOL.
And the fact that I have a micro-tower sitting on my desk that provides 3G signal and the phone still can't accept 80% of phone calls/texts unless it's sitting in just the right spot on my desk.

[Melqui]

In Brazil, low level Samsung smartphones has VoLTE, super powerfull ROG II not!!!! Unbelievable!