So I just received my Poco X3 NFC. Before I purchased it I made sure that it supported the 4G bands that Boost/Telstra uses for VoLTE. I went ahead and dialled ##86583## to enable VoLTE and also dialled ##869434## to enable VoWIFI. The VoLTE logo doesn't pop up at the top of my screen and when I go to make a call it changes over to 3G. I swapped sim card slots and restarted the phone, but it still doesn't work. If I pop my sim into my Galaxy S8 VoLTE works straight away.
Does anyone know how to get VoLTE to work?