According to this thread, I understand VoLTE is supported by the pinephone on the modem side and controlled through simple AT-commands:
https://forum.pine64.org/showthread.php?tid=12560
So if your carrier happens to be supported by the pinephone modem firmware, VoLTE should work automatically. I guess this is something entirely different to the Xperia devices where the VoLTE-part would probably have to be implemented on the software side (correct me if I’m wrong). At least, none of the commands mentioned in that pinephone forum thread is available on the Xperia.
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