Thanks for the info!
I do have Cox High Speed internet...going on 20 years. The only thing I cancelled was my Cable TV. I went with a rooftop antenna.(One time cost). I use the Cox Internet wirelessly through my Router to access Amazon Prime which I already had for free shipping. And yes, we tried connecting the new Cox phone with WiFi turned off.
How do I find out if my landline is "in contract?" I have been calling Cox about every other day to ask how things were going. (Texting is useless).
I have been told more than once by tech support that it is compatible. I am aware that Cox is a MVNO of Verizon. I have been on Verizon's website to see I could learn anything, but got nowhere. I have been told by Cox (it is the first thing I asked) that my landline is compatible. In checking the list of Verizon MVNOs online I noticed Cox was not listed, but the webpage is probably old. (One of my pet peeves...rarely do webpages give you a date when the info was posted).