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It's not well known but I believe all of 911(us), 112(eu), 000(au) will work in all of the above countries. And others, almost certainly.

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112 is an emergency number "by specification", it will always work (on GSM/UMTS/Vo LTE networks, NOT on landlines)), no matter what country you're in. I think this also applies to 911, although I'm not 100% sure about this.

Numbers like 000 are a different matter, there are scenarios in which they might not work even if you're in Australia (when you have a non-australian SIM or no SIM at all, for example).

For more about this, see e.g.

https://nickvsnetworking.com/tales-from-the-trenches-emergen...

AFAIR, 112 is defined by some ITU or 3GPP standard, which is honored in at least Europe/Russia region. In other places different numbers might as well be routed to it or (even better) redefined inside terminal software (SIM). But I no longer work in that area, so can't be 100% sure.

At least 112 and 911 are standardised in GSM. https://www.gsma.com/newsroom/wp-content/uploads//NG.119-v1....

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