This app was mentioned in 3 comments, with an average of 2.00 upvotes
I used GrooVe IP with my Google Voice phone number to make free VoIP from Europe to the united states on G3. The sound was just as good if not better than using my regular cell phone network at .25 cents a minute. You don't need to use the built in T-mobile VoLTE
https://play.google.com/store/apps/details?id=com.gvoip&hl=en
Wifi is wifi. You can't use your verizon phone as a traditional phone per se, but you can still use it for all the non-phone/text related items (basically only things that would go over data).
Get yourself a cheap dumb prepaid phone for the other stuff.
Beyond that, you don't get to complain much if you're going to throw out the poor college student card.