It turns out the difference between what devices work for 000 on Vodafone and those that don’t is quite literally a 1.3 Kilobyte text file!

That’s the ‘fix’.

This file has the VoLTE 000 settings for Vodafone.
Whereas Optus and Telstra have had settings and support for the feature since at least 2017. 

Your device Does NOT need Android 13 or higher, nor a ‘Custom ROM’ (if on an older version).

Your device simply just needs a little more than the 1KB worth of settings for Vodafone’s 000 ‘SOS’ Network.

[…]

Reportedly Vodafone is also now moving to a more restrictive device ‘whitelist’ blocking ‘unknown’ capability devices, including some phones recently sold at Officeworks!

Seems TPG/Vodafone is trying to improve how the list ’looks’ whilst not actually addressing the problem and punishing consumers in the process.