Does the network icon look like it’s searching? When it works it the icon will keep like that but ‘wifi calling’ will show up next to it if you have another cellular data connection.
Sorry for double post, the other option is to put the data sim on a separate device with wifi hotspot capability. Connecting to it via wifi will also enable wifi calling on the nz sim.
This guide should help. With your iPhone you can use Wifi calling on the NZ sim by using the mobile data from the Australian sim but yea it seems strange that it did not work for you when overseas unless you choose manual selection for mobile network on NZ sim. I’m not sure if other smartphone brands allow you do this but with Apple it seems they allow doing that from the start.
“With Allow Mobile Data Switching turned on, the status bar shows that Service Provider 1 is using 5G, and Service Provider 2 is using the mobile data of Service Provider 1 and has Wi-Fi calling enabled.”
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