Telstra and Optus will not delay their 3G mobile network shutdown, despite an inquiry warning it could cause considerable threats to public safety.
Telstra is due to close the ageing network on August 31, having already delayed its original June deadline, while Optus will shut down from September.
Vodafone closed its operation in January.
However, a Senate inquiry examining the potential risks of the closure was told critical medical equipment, fire alarms, EFTPOS machines, and waste and water infrastructure could be cut off in the shutdown.
Despite this submission to the inquiry, the telcos have confirmed they will not be delaying the shut down any further.