"Airtel submitted application last month for UL in Delhi and Kolkata," an official source told PTI.
Licences of Airtel in Delhi and Kolkata are expiring in November this year. A Unified Licence (UL) would be required to continue operations in each service area.
Bharti Airtel sources confirmed the development.
A Unified Licence, which is not bundled with spectrum, enables a firm to provide technology neutral telecom services.
The company in February purchased spectrum worth Rs 8,721.17 crore in these two service areas.
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Telecom operator Vodafone will have to sell 4.4 per cent indirect stake Bharti Group firm after the new licence becomes effective. Under new licensing regime, telecom operators are barred to hold any direct or indirect stake in competition.
Vodafone and Airtel currently operate on Unified Access Service Licence (UASL), or 2G licences, under which telecom companies are permitted to hold up to 9.9 per cent stake in other firms.