Meanwhile, while I expected VoLTE to have been fully operational in Italy for a long time, I just discovered that, out of the four Italian mobile operators:
- Iliad does not support VoLTE altogether.
- Vodafone does not have any Sony phone in supported models.
- WindTre only supports the Sony Xperia 5 II (why just that, I don’t know).
- I cannot find a list of supported devices for Tim, but its low cost brand Kena Mobile does not have any Sony terminal in the supported ones.
Therefore, it is currently impossible to use VoLTE in Italy on a Sailfish device.