"With the launch of 3G services in Kolkata, it has now become the second metro after Delhi where Idea has set up its own 3G network", Lakshminarayana, Chief Operating Officer, (Corporate), Idea Cellular, said in a statement.

With this roll-out, Idea's 3G network has expanded to 13 major markets in India.

The mobile operator has nearly 20 lakh customers in Kolkata.