Bharti Airtel claimed to have signed up 2 million 5G customers in each of two additional regions, taking its total count to more than 10 million.
The operator stated 5G subscribers topped 2 million in Uttar Pradesh East, and Bihar and Jharkhand.
In May it hit the 2-million mark in Mumbai, Tamil Nadu, and Andhra Pradesh and Telangana.
The next-generation service now reaches more than 3,500 towns and villages across the country, up from 3,000 in late April.
Airtel reiterated it is prepared to cover every town and key rural area by September.
It launched unlimited 5G data in April to encourage customers to sign up to the service.
Airtel ended March with a total of 335.4 million mobile subscribers, with LTE users accounting for 67 per cent.
Rival Reliance Jio’s 5G coverage spanned 2,300 cities and towns at end-April.