On Thu, 1 Aug 2019 10:00:51 +0100, The Natural Philosopher wrote:

For the avoidance of doubt my 3 mobile wifi calling works through IDNET
broadband, BT broadband, and indeed any other connection in any other
country I have so far tried it in

I'd expect it to but you're missing the point that very few MVNO's
offer WiFi calling. It's pretty much limited to having your phone
service (not network) provider being one of the four, O2, Vodfone, EE
or 3. And thus almost certainly paying 2 or 3 times as much as one
needs to.

--
Cheers
Dave.