For those that didn't get the message, here's why and what you can do.AusAlert will be officially rolled out in October as a way for emergency agencies to warn people about life-threatening emergencies.The alert is designed to ensure warnings are not missed, so it will override "do not disturb" or silent mode settings.People who didn't want to receive the notification were advised in advance to turn off the device or put it in aeroplane mode "We've obviously got a website, AusAlert, so people can go and provide direct feedback to that if they don't receive the alert or they do and they want to provide some advice about how their phone worked," Emergency Management Minister Kirsty McBain said.The National Emergency Management Agency, which is looking after the test, said people may experience the test differently depending on where they're located, what kind of device they have or their settings."Some people may receive the alert immediately, some may receive it later, and some may not receive it at all," it said."The purpose of testing is to understand these real-world differences, confirm the system is working as intended, and improve public information before AusAlert is used in real emergencies."For the latest from SBS News, download our app and subscribe to our newsletter.