dsffd3124 i dont have those toggles and when i change to 4g and 5g only phone calls dosnt work at all.
Then it is most likely not supported, though they might need to do something on their end to make it work for you (with the shut down happening soon, I find this unlikely).
The VoLTE toggle should be in the SIM settings, same place you found the option for 4G and 5G only.
dsffd3124 i guess i could buy a router i take everywhere and use that for calls with signal and wi f
VoWiFi probably won't work either if there is no support for VoLTE.