@lakotaubp For what it's worth, on my Faiphone 4 and Ubuntu Touch calls work fine.

Thank you that is a clear statement VoLte possibly in 12 months. So I won't have to ask that question anymore. I think Ubuntu Touch will work much better with Ubuntu 20-04 as a substructure. I understand that this will be a Mahmut project for the developers. Good luck guys, you can do it already 🙂

@alyosha
2G and 3G drop by providers in USA, and VoLTE not working on UT for now, is device agnostic.

@applee Thank you very much, it works now perfectly thanks to this.

Here's what I do: I've prepared a gprs file on my Linux box. First I turn off Cellular data in the UI, then I adb push it to the phone, then adb shell to the phone, then sudo cp the gprs file to /var/lib/ofono/###########/gprs. When I turn Cellular data back on, the gprs file on the phone is immediately overwritten with the original one, that I get when I Reset All APN Settings in the UI. Where are those settings coming from? From the cell provider (Google Fi)? Some other file on the phone? So, I can't use the UI to set the APN I want and I can't hand code it in the gprs file. What's it gonna take?

@livanti21
When you enter your APN , then save it,---after you reboot ,and go back to check which APN is being used ,do you get a little box that you need to put a check mark or tick in ?
The 2/3/4g part , I just moved on to the next item, I did not select any of them ( I was using Consumer Cellular,(att).