Why can't I make wifi calls with my Sprint Note 5?

[edsbbq]

cant make outgoing wifi calls with sprint note 5

cannot make outgoing wifi calls (says unavailable at this registered location) have talked to 7 (yes,7 ) techs, and no one has answer. wife has iphone 6 and works fine.can still swap phone out, but dont want a iphone! p.s. can receive calls fine.