No Volte in deutschland

[baksitibor]

Ich möchte VolTe in deutschland haben

[Jesp_r]

In Spain we do not have volte either. Asus please, implement it in more European countries.

[Jakeo]

Even countries with high number of Rog phone 3 sold have no volte. Chances at this point of anymore countries getting support is near zero.

[Hydemus]

Asus dont care about VoLTE anymore on this device... Many users already complaint about this... Time to switch the device if you need VoLTE

[BPM]

I probably can't go into details here, but there is a way to force enable VoLTE and VoWiFi without root. I've done so, and it persists even after rebooting (as ASUS hasn't officially added support for T-Mobile in the US).
All I can say would be to search on Google/DuckDuckGo/whatever about setprop VoLTE.
I can't walk you through it, and any changes are made at your own risk.