@cinebox e911 is specific to the US and Canada. Many other countries don't have this.
In Australia there's an app called Emergency Plus ( emergencyplus.com.au ) developed by emergency services and government, which assists with 000 calls by showing on screen your latitude and longitude, your nearest address, and – of course – the What3Words for your location. The app doesn't automatically send this data to authorities when you make a call, you're expected to read it out to them.
@cinebox You might also note that all the cases highlighted in the link posted by @jonty are specific to the United Kingdom.