Idea Cellular and the Indian unit of British telecom company Vodafone today announced a merger, creating India's largest telecom operator. The merger will create India's largest telecom operator with around 40 crore customers or nearly one in three customers in the country. The combined entity of Aditya Birla group's Idea Cellular and Vodafone India will have the widest network in the country and pan-India 3G/4G footprint, the companies said in a statement.