"LoI (Letter of Intent) to Airtel was issued early last week for Delhi and Kolkata," a DoT official told PTI.
Licences of Airtel in Delhi and Kolkata are expiring in November this year and it will need Unified Licence (UL) for continuing operations.
An UL, which is not bundled with spectrum, enables a firm to provide technology neutral telecom services.
In a letter to the Telecom Ministry in July 2013, Vodafone had said it holds 4.4 per cent stake indirectly in Bharti.
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Vodafone has to sell its entire stake in Airtel following new norms issued by government that bars a telecom operator from holding any kind of stake in competiting firms under Unified Licences.
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.
Vodafone also has applied for UL in Delhi, Mumbai and Kolkata but is yet to get LoI for DoT.