Major telcos are facing pressure as the 3G network prepares to shut down.
The key priority for the companies currently is to ensure every Australian can connect to triple-zero when the 3G network shuts down from next month.
Telstra is due to switch off the network on August 31, having extended its original June deadline.
Optus will shut down from September, with Vodafone having already closed its 3G operation in January.
But there are still over 100-thousand mobile phones across the nation that are not compatible with 4G, according to latest industry figures provided to the government.
These devices use 4G data for regular calls and texts, but drop triple-zero calls to 3G.
The number of these devices in use has reduced significantly since March, after the government formed an industry specific working group.