Another requirement is that person should also have VoLTE enabled.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
You are correct sir. It does show up when calling a Vzw user with it also turned on. Shame it doesn't work across carriers.It should only show up if another person is on Verizon LTE and has a video calling capable phone.
When you type *#*#4636#*#*, it shows that video Calling is provisioned. And it shows up in phone settings. But, it doesn't show up when making a call, or during a call. What's up with that?
It should work across carriers in the future. Verizon and AT&T promised it this year: Verizon, AT&T offering interoperable VoLTE to some customers | FierceWireless I wouldn't hold my breath though, because they already missed their previous deadline, which was the end of 2015.You are correct sir. It does show up when calling a Vzw user with it also turned on. Shame it doesn't work across carriers.