Vodafone has completed a successful trial of its first voice calls using 4G - also known as Voice over LTE or VoLTE.
The mobile provider is carrying out extensive laboratory and field testing of the technology before making 4G calling available to customers later this year.
According to a company statement, VoLTE fully integrates voice and data for a better customer experience.
It allows mobile phone users to talk on their device and access 4G data at the same time, instead of the current technology which sees smartphone users drop back to 3G when making or receiving calls.
Vodafone chief technology officer, Benoit Hanssen, VoLTE, provided call connection times that were two to three times quicker.
"There’ll be virtually no lag between pressing the call button and being connected to the number you’ve dialled,” he said.
“Vodafone will be one of the first to launch VoLTE in Australia."
He said it was the next stage of our network evolution made possible through the introduction of our new core network.
VoLTE-compatible smartphones include the iPhone 6 and 6 Plus, the Samsung Galaxy S5 and Galaxy Note 4, and Australia’s cheapest 4G smartphone, the Huawei Ascend Y550.
There are more than two million devices connected to the Vodafone 4G network, which now reaches 95 per cent of Australia’s metropolitan population.