The document summarizes the growth and revolution of the Indian telecom sector over the past few decades. It notes that the contribution of services to India's GDP has grown from 45% in 2000 to 55% in 2010. The telecom industry in particular has witnessed explosive growth, with mobile subscribers increasing from just 1 million in the early 1990s to over 500 million by 2009. Key factors driving this growth include reforms allowing private operators to enter the market in the early 1990s, lowering of mobile call rates, and the rollout of improved technologies like 3G. The rapid expansion of telecom infrastructure and services has brought about a tremendous revolution in Indian society by connecting more people across economic classes.