I have 2 Verizon Galaxy s7 phones that are supposedly identical, but one has an advanced calling option in the Settings > Connections menu that allows me to turn on and off HD voice and video. The other does not. As a result, I cannot use video or HD voice on the phone that lacks that oprion.
I have spent over an hour with Tier 2 tech support with no result.
The exact same question was asked 2 years ago and someone found a solution that worked. The solution was to dial *#*#4636#*#* which would bring up a test menu that allowed you to check/uncheck three options, one of which was voLTE. Checking that fixed the problem for several people. Verizon seems to have fixed that so that now when you dial that code, you get a message saying that number can't be reached.
So I am stuck and have no idea how to activate voLTE or video calls on this phone.
By the way, voLTE and video used to work on this phone when we first got the phone, but Verizon took care of that with one of its wonderful updates. (Somehow they messed up up on the other phone because it still works.)
Any help solving this issue would be greatly appreciated.