Vodafone Idea has already made an official statement that they wont introduce IUC burden to customers.Airtel /Vodafone and other telecom operators would introduce IUC probably
Vodafone Idea Limited (VIL) has responded saying they have no such intention of separately billing their users for calls made outside the Vodafone Idea network. Vodafone Idea says they do not want to burden customers with the task of identifying whether the call they are making is on-net or off-net, every time they decide to make a call. Vodafone Idea says all their subscription plans for prepaid and postpaid users on Vodafone and Idea do not distinguish between calls made within the Vodafone Idea network or to other mobile networks.
Source: Vodafone Idea Says Their Customers Don’t Have to Bother About IUC With Unlimited Calls