Idea is the only company having the strongest network in India. No other company can beat Idea in terms of their network. The signal strength is so strong that even in the worst situation you will at least have one stick available on which you can make a call and have a clarity of voice. That's the beauty of Idea's network as I have personally experienced it when I was lost in a jungle with some of my friends in Pune where we visited one of the Shivaji Maharaj's Fort.
Though the pricing is high in Idea, yet they are worth buying.