I run Google Pixel phones as personal devices (but also for app development and testing).
Current phone (Pixel 4 XL) definitely supports VoLTE, my SIM if swapped to a Vodafone sourced handset does support VoLTE, but it will not provision when in my current 4 XL.
Is it possible to white-list the Pixel 4 XL generally (eg. Australian model) or a particular IMEI?
I've come across this frustration a few times amongst folks who run Po uxel devices to be closer to Google's Android development roadmap. Otherwise, if we are "trapped" in the IEM world of Samsung etc. We can be up to a year behind the current releases for day-to-day use....