Both Airtel and Vi lost 4.6 million and 4.3 million subscribers, respectively.
Industry experts believe the loss in user-base is mainly due to the lockdown and reverse migration to villages.
The inactive users are removed from the list of subscribers 30 days after non-payment of tariff.
Various states across the country were under lockdown in May to curb the spread of the novel coronavirus. The decision resulted in migrant labour, mainly in urban areas, moving back