Reliance will increase tariffs on discounted and promotional plans for its pre-paid customers by up to 20 percent and raise headline call tariffs to 1.6 paise every second from 1.5 paise, it said in a statement on Tuesday.
Reliance and its main rivals, including Bharti Airtel Ltd, India's top phone carrier, and the local unit of Vodafone Group Plc, last year raised voice prices for the first time in three years as they continued to cut discounts previously offered to lure customers in a highly-competitive market.
Carriers have seen the benefits of reduced competition after several smaller rivals were forced by a court order to either shut down or scale back operations.
"We continue to focus on growing profitable/paid minutes on our network and the current tariff hikes are part of our continued efforts to reduce free and discounted minutes, and offset the ever-rising costs of input materials," the company's chief executive officer, Gurdeep Singh, said in the statement.
Indian carriers receive more than 80 percent of their revenue from voice call services.