I have an galaxy s6, and I received my software update yesterday. I just discovered that my wifi calling is no longer activated. Under the advanced calling option it states "push to activate advanced calling" when I attempt to do that it states it was already activated and need to restart mare phone to make it available. I do that and end up right back at the beginning, when it stating I need to activate advanced calling. The activate wifi calling option is greyed out and can not be selected.
Also on an annoying note my phone is now regularly telling me is can't connect to facebook, even though it is receiving both wifi signal.
I fixed mine by signing into My Verizon, My Plan and Services, Manage Products and Apps, Manage Your Products..find HD Voice and remove it from your line...wait a bit, then try to reactivate from your phone..i got some new screens and was able to add it to my account again...wait a bit..reboot...and it works!