@NoTechno 

Perhaps I should better explain my problem.  I can connect to the internet over my home wifi.  I can do searches on the phone, and view websites.  I cannot make or receive calls or texts.

My understanding is that once the phone detects wifi, a menu choice should show up under Settings, Connections, allowing wifi calling to be toggled on or off.  I do not get this menu choice.  It never shows up. (I understand that this toggle can also be reached by tapping on the phone icon, going to settings, and it should be on the next menu, but it is not there, either.)

I have followed all the suggestions from Samsung.  They bumped me up to the next level of tech help, who told me that wifi calling was not available on unlocked phones.  I refuse to believe that!

I have also made sure that wifi calling is enabled through my cell service provider (Ting Mobile).

This is why I am wondering if it is somehow the router preventing wifi calling from happening.  I will be trying to change the SSID and channel on the router next, to see if that helps.

Thanks for trying to help me!