On VZ: All advanced features work, including video calling, WiFi calling, etc.
On T-Mo: Video calling is inconsistent, but this may be a network issue. WiFi calling, VoLTE, HDV all work.
On ATT: No, nada, nunca, nyet
Where exactly in Settings is showing up, Phone settings? just asking because when you take a look at that thread on the link the guy mentioned that he tested this with Verizon, T-Mobile and AT&T. I'm on T-Mobile and when I enter to the menu my Video calling is off, I turn it on but it won't stay on, it always go back to off, so I never see it on the Settings, but I'm wondering how did this guy test it with T-mobile if i can't simply keep it on.