Vodafone Idea will be the country's largest telecom operator, with a revenue market share of around 37.4 per cent and more than 438 million subscribers. The UK-headquartered telecom major, Vodafone, had announced the merger of its India operations with Kumar Mangalam Birla-led Idea Cellular in March last year. The companies were hoping to complete the merger by the end of June but the process got delayed by a month. The DoT had given a conditional nod to the merger a couple of weeks ago if they paid up Rs 72 billion as spectrum charges.