Will be interesting to see if this applies to Vodafone, as I haven't seen any messages despite using an imported phone. And the messages I received from Telstra were somewhat justified as the phone is missing B28, but that's more of a coverage issue.
A shitshow in any case. VoLTE should really have been a core part of 4G and not this tacked on proprietary upgrade.
Vodafone's 3G network has been switched off for 9 months at this point, I don't know if customers would still be getting messaging about it. Though there was a section in the article about issues with roaming for international visitors in January:
As a result of the Vodafone 3G switch-off in January, inbound Roaming customers have been receiving text messages advising they will no longer have access to voice, text or data and emergency calling whilst roaming in Australia.
Even customers with 5G iPhones have received such text messages.
He published another article recently about exactly that. It sounds like the telcos are putting in less than the bare minimum of effort and the government has been too clueless to hold them to account. And when it does try to legislate it has done so in a nonsensical way that risks hurting more than helping.