If there is one business that is the crown jewel in the Aditya Birla group’s portfolio, it is telecom. Today, Idea Cellular is the group’s most profitable company and has been a big success story, given its chequered past. From a distant sixth in 2006, it is today the third-largest player in the country, with 158 million subscribers — over half of them from rural India — and 22 circles under its belt. Its operational turnaround has been backed by an equally strong financial performance, with its top line and profits showing a CAGR of 33% and 34%, respectively, over the same period.