The Australian Labor Party has questioned the value apportioned to the NBN Co by its chairman Ziggy Switkowski, who said during a Senate Estimates hearing that the company could fetch a price of $50 billion if it was sold post-2020.

The chairman of NBN Co, the company rolling out Australia's national broadband network, has told Senate Estimates that the NBN could still fetch a price of $50 billion once it is fully rolled out in 2021.

The advent of 5G networks will not provide any kind of salvation for telecommunications providers who are desperate for some way of fighting back against the unreasonably high prices charged by NBN Co, a report from the credit ratings agency S&P Global Ratings says.