"This new pack facilitates all outgoing mobile calls – local, STD and while roaming at 1 paise per second anywhere in South India. Besides, there would be no roaming charges across the region," a company statement said.

Vodafone has about 35 million prepaid customers in Tamil Nadu, Andhra Pradesh, Telangana, Kerala and Karnataka.

"Having closely studied these customer usage patterns, Vodafone has designed the One rate, One South pack for the benefit of 35 million prepaid customers in these five states," Vodafone India Operations Director-South Suresh Kumar said.

Around 12 percent of 14 million prepaid customers in Tamil Nadu used to pay roaming charges, particularly during festive occasions, business head for Tamil Nadu S Murali said, adding it has been designed so the customers can remain worry-free, convenient and connected.