Using Visible WiFi calling to US from Europe


I set up Wifi calling on my Visible and my wife's Visible plans.  While the "features" charts indicate Wifi calling (from OUTSIDE of the US to the US) is on both Visible and Visible+ and free, the human being I (finally) got in contact with via Chat insisted we had to upgrade to Visible+.  Is that the case or not?


My wife and I will be in several European countries 9/18 - 10/5 and need phone service, though we do not need local eSIM capability at this point.


Thank you in advance for your responses.