India's upcoming 5G spectrum auction has been delayed again, just days before the auction was set to take place.

India's Department of Telecommunications (DoT) has delayed the auction until June 25 as reported by Economic Times. It had been due to take place this week (June 6).

It's the fourth time the auction has been pushed back after it had initially been set to take place in March.

It was then set to take place last month before it was delayed until June 6 due to the country's general election.

ET reports that the DoT had amended its Notice Inviting Applications (NIA) to push back the mock auctions to June 13 and 14.

The reason for the latest delay is not yet clear, though India announced this week that Narendra Modi and his Bharatiya Janata Party won the country's election.

A total of 10,523.15MHz of spectrum worth 963.17 billion Indian rupees ($11.65 billion) will be put up for sale when the auction kicks off.

The base price has increased from nine to 12 percent per unit since the last auction two years ago.

In total 5G airwaves across eight bands will be up for grabs, including 5G airwaves in 800 MHz, 900 MHz, 1,800 MHz, 2.1 GHz, 2.3 GHz, 2.5 GHz, 3.3 GHz, and 26 GHz bands.

Only Reliance Jio and Bharti Airtel have launched 5G services in India to date, while cash-strapped Vi said it expects to launch 5G in the next few months. Mavenir Telecom said it expects to sign a contract with Vi for the deployment of its 5G network this year.