Sprint chat this morning. Point proven
Jane C.: I'm sorry for your inconvenience. I’ll help find a solution for you as quickly as possible.
Jane C.: I see that you are using Note 3 on this line
Jane C.: Please be advised that wifi calling feature is available only with Samsung galaxy S4 mini & galaxy Mega
Jane C.: I am sorry as the phone is not compatible for this feature so you are unable to use that
You: It is available for the Note 3
You: N900PVPUCNC5 04/02/2014 Enhancements: Wi-Fi Calling
You: I have friends who have been able to enable theirs but others, including myself who have not
You: It never worked on my Galaxy Mega when I was using it also. Is there an issue with Sprint in my area?
Jane C.: Let me check
Jane C.: Please wait
And I'm still waiting LOL