konfusd:
Wifi Calling needs a software update to work. As far as I'm aware we have never sold any Poco phones so they will never get an update with the required configuration. This applies to VoLTE too (note our VoWifi implementation is tied to VoLTE, and needs that to be enabled first).
Re: the A8 - I believe these are only getting security patches now, so they might be too old. I can see that they they are not currently on the (internal) VoWifi roadmap, and I believe they are not enabled for VoLTE on our network either.
For reference the list of devices currently enabled for VoLTE is here: https://www.vodafone.co.nz/our-networks/volte/
Oh well I guess once the sure signal stops its a good enough time to switch the kids and wife over to Skinny. If we have no signal we may as well pay the least amount possible.
(Mines a work account so I'm stuck with vodafone)