Had there been an update with volte support being added to UB touch now ?

I have a oneplus 6t running 20.4 I think it is. I have us cellular and can't get any mobile calls or data or Anything to work. Since us cellular is t mobile I was hoping there was a way to make it work.

With volte working on certain phones, has anyone got it working in the USA. I assume it would be on t mobile network since that seems to be the easiest.
I'd love to use ubuntut touch, I don't mind not having stuff working, but I at least need calls and texts.

@MrT10001 I did not use trwp just local update.
But I did get it to go. I reset the phone, used the zip from the XDA link you put, then used a different computer with a fresh ubuntu install, flash UB24 from there it booted into recovery, I then flashed UB20 from the installer and was able to update to 24. Not sure why that worked but it did.

Thank you for helping.

EDIT
so I posted that while it was updating to 24.0 and it rebooted right back to recovery and that was it, I was able to re flash 20.0.
So I assume 24.0 just does not work on the 6t as of yet, which is cool since it is still new.

@MrT10001 got it to download, had to edit my etc/host file and add the oneplus site IP.

But it went right back into recovery again.
I'll try some more stuff tomorrow since I'm off.

Thank you for the help so far, I really appreciate it.

@MrT10001 none of the download links work for android 9 sadly. I'll look for other downloads.

@MrT10001 awesome I'll try one of those. Should I use the lowest one the 9.0.4 I think I saw ?

@MrT10001 I tried again
Msmtool
Local update android 9 from oneplus
Unlock bootloader
Allow debugging and check always allow for that computer
Used installer 10.0 cleared cache first

This time it started by downloading 2 files, then flashed firmware in like 2 seconds, had me reboot to recovery and started the download on 11 of 14 and went through. Booted hung on UB lineage logo then went to recovery.

Same result on windows and Ubuntu machines, two different laptops. Used USB 2.0 and 3.0 and different cables with no avail.

The next thing I'll try when I get off today is to do a fresh Ubuntu install on a different laptop and try that.

Could it be the android 9 zip I'm using from oneplus website ?

I'm really confused because I've installed UB on this device before with no issues from the installer.

I tried again last night.

Msmtool back to android

Installed stock android 9 zip file from oneplus website using local update.

Unlock bootloader

Go back into android allow USB debugging

Try to flash with installer, it goes really fast on
Flashing fimrware
Then starts the downloads at 10 of 14 and goes from there and pushes Ubuntu touch files.

Puts into UB recovery, then if I reboot or do anything it just goes the bootloader is unlocked screen unless I reboot in fastboot.

I tried on a windows machine and a Ubuntu machine. Used 11.2 and on the windows one tried the 11.2 and 8.8.
Tried flashing UB 20 and 24 both did the same thing.

@MrT10001 that's what I thought. I have 11.2, used msmtool back to 9 and then unlocked bootloader, enabled USB debugging then tried the installer.

I wasn't sure if maybe something else needed done since I had postmarket on it.

Also even once UBT was booted the installer wouldn't recognize the phone. And with UB installed that way there was no recovery, when I booted recovery it just went straight to the OS.

Re: How I installed on the OnePlus 6t (long read)

So I can not get the installer to work. Everytime I use it it just boots into recovery and that's it. I followed the post above and got UBT to bolt.
But then there was no way to see version number, and under updates there was no cog to change the release and update image.
Its a normal 6t and I had UBT on it before, but I went to postmarket os for awhile and used msmtool to go back and am now trying for UBT again with no avail.

Am I missing something. I've tried the installer on a Ubuntu machine running the latest installer and on windows with the latest and 8.8 beta.

@Futura am following. I would love to buy the device if UBT will work on T-Mobile.

So I updated my vollaphone 22 to focal ota-9. The latest update said it has volte, but the toggle switch won't let me turn it on. Is it because I have a Verizon Sim card in it and it just doesn't support that network ?
I don't currently have another Sim to try yet.