Shares of Idea Cellular gained over 4 per cent on Monday ahead of the Department of Telecommunications (DoT) likely approval to its merger with Vodafone India, which will create the country's\u00a0largest mobile service operator. The stock rose 4.2 per cent to Rs 63.20 on the National Stock Exchange, the biggest intra-day percentage gain since the second week of June. On the BSE, Idea's shares rose by 4.13 per cent to record\u00a0on intra-day high of Rs 63.10 per share. The telecom department is expected to approve the merger of the two telecom firms Vodafone India and Idea Cellular today, PTI reported on Sunday citing official sources. The combination of Idea and Vodafone's operations is expected to create the country\u2019s largest telecom operator worth over USD 23 billion (or over Rs 1.5 lakh crore) with the proposed name of Vodafone Idea Ltd. The likely approval news lifted the stock of Idea Cellular by as much as 4.2 per cent, which is the biggest intra-day percentage gain since June 8,\u00a0reported Reuters. The telecom firm's stock has fallen about 44 per cent this year up to Friday. The merger deal was announced by Vodafone and Idea last year to create the biggest telecom business in the country after the entry of a new rival sparked a brutal price war. The merged entity will have a 35 per cent market share and a subscriber base of around 430 million. The deal is also expected\u00a0to give breather to both the debt-ridden firms - whose combined debt is estimated to be around Rs 1.15 lakh crore -\u00a0from cut-throat competition in the market.\u00a0An extraordinary general meeting will be held on June 26 by Idea Cellular to change the name of the merged entity to Vodafone Idea Limited following the completion of the merger. Vodafone will own 45.1 per cent, Kumar Mangalam Birla-led Aditya Birla Group will have 26 per cent\u00a0share and Idea shareholders will own 28.9 per cent in the combined entity.