The rankings were put out on Monday. In second spot was Singapore, followed by New Zealand, Switzerland, Norway, Finland, the UK, Ireland, Denmark and the Netherlands, with the US 11th.
A total of 170 countries were included in the index, with the world's newest nation, South Sudan, bringing up the rear.
Key metrics taken into account were coverage, gross national income per capita, mobile connections, rural population, mobile broadband connections and the country's population were used to compute a score for the index.
Chris Althaus, head of the Australian Mobile Telecommunications Association, a lobby group for the mobile industry, said it was a great achievement for Australia.
“As we continue to navigate through the circumstances surrounding COVID-19, the Australian mobile telecommunications sector networks continue to provide essential services critical to meeting the changing connectivity needs of the Australian population," he said.
“To be recognised as the number one nation globally in this space for the sixth consecutive year is a reflection of the strong dynamics of the Australian mobile sector with intense competition, high levels of industry investment supporting world class networks, and the latest generation of mobile technologies, applications and services - notably our 4G/5G ecosystem."
Althaus described mobile connectivity as a key enabling technology that would support productivity and connectivity to the benefit of the Australian economy and society.
“According to AMTA’s most recent research report, Mobile Nation – The 5G Future, conducted by Deloitte Access Economics in 2019, 4G/5G mobile enabled services are forecast to boost the economy by $65 billion by 2023, which is equivalent to $2500 for every Australian," he said.
“AMTA is aware the impacts of the pandemic will affect these figures, but the central role of mobile telecommunications remains clear – to keep Australians connected during and after the pandemic and to meet the challenges posed by our COVID-19 recovery and into the future.
“Australia is a mobile nation and a global leader in mobile telecommunications, with more than 35 million mobile voice and data services in operation for a population of 25 million. We are well positioned and can be confident in our future as we face these challenges with the benefit of a world-leading mobile sector.”