Telstra and Optus have jointly delayed the shutdown of their 3G networks until October 28, following concerns raised by a Senate inquiry regarding public safety risks associated with the switch-off. The two telecommunications giants plan to launch a mass public awareness campaign to ensure that users, particularly those with older devices, are informed about the impending changes and how to verify their device compatibility. Over 70,000 4G devices may lose the ability to make emergency calls after the switch-off, highlighting the need for customer education. Both companies have previously communicated extensively with their customers but acknowledge that some may still be unaware of the necessary actions to take. The inquiry emphasized that various devices, including medical equipment and ATMs, still rely on 3G, potentially endangering public safety if the switch-off proceeds as initially planned. The delay aims to mitigate the risks and ensure a smoother transition for all users.