Shardul Amarchand Mangaldas and Co said the regulator has "unconditionally" approved merger of the telecommunications businesses of Vodafone India and its wholly-owned subsidiary Vodafone Mobile Services, with Idea Cellular.
"The USD 23 billion transaction is the largest transaction by value in the history of Indian M&A," it said in a statement.
Shardul Amarchand Mangaldas and Co advised Vodafone India and Vodafone Mobile Services on the deal.
According to the statement, the regulator carried out a comprehensive review of the transaction and concluded that there was no appreciable adverse effect on competition from the proposed merger.
Phase 1 refers to the deal being approved within 30 working days as provided by the Competition Act.
Law firm Trilegal, which advised Idea Cellular on the competition law aspects, said the deal with Vodafone India has received CCI approval.
"The proposed merger involved a merger of two of the biggest telecom companies in India and will create the largest telecom player in India, creating significant efficiencies and synergies," Trilegal said in a separate statement.
Mergers and acquisitions beyond a certain threshold require approval of the Competition Commission of India (CCI), which keeps a tab on unfair business practices across sectors.
The deal, announced in March this year, will create the country's largest mobile phone operator worth more than USD 23 billion with a 35 per cent market share.
Post the transaction, Vodafone will own 45.1 per cent stake in the merged entity while the Aditya Birla group, Idea's parent, will have 26 per cent shareholding after paying Rs 3,874 crore cash for a 4.9 per cent stake.
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