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Telstra, Optus and Vodafone update the last known location of your mobile phone in many different ways when it interacts with the network, such as by making or receiving a call or text message.
The networks automatically update the location of all mobiles when they connect with the network to make a call or a text. Smartphones are connecting with the networks all the time in the background, so the network can detect your location almost instantly. .
Telstra, Optus and Vodafone’s 4G location detection systems are now fully compatible with location-based Emergency Alert.
4G mobile phones used outside 4G network coverage areas revert to the 2G/3G networks, where they can still be detected by Optus, Vodafone and Telstra and sent a warning message using location-based Emergency Alert.
All 4G mobile phones on the 4G networks will continue to receive messages based on their registered service address when this is within the warning area.
Mobile phones switched off or outside a network coverage area will not have their location updated and, therefore, the carriers cannot detect them and they will not receive a warning message from Emergency Alert.