Reliance Communications will raise tariffs by up to 20 percent for all its pre-paid customers across the country from April 25, the company said here Wednesday.

The headline tariffs or the call rates will rise from 1.5 to 1.6 paise per second, while tariffs on discounted and promotional plans will increase by up to 20 percent.

"The revised tariffs, which will be applicable for pre-paid customers across the country, come into effect from April 25, 2014," the company said in a statement.

"At Reliance Communications, we continue to focus on growing profitable or 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," Gurdeep Singh, chief executive officer, Consumer Business, Reliance Communications, said.

"We expect RPMs (revenue per minute) to improve over the next few quarters and this will impact our performance positively," he said.