The call charges will be 1 paise per second, it said.

RCom is the latest mobile service provider to offer the per-second tariff. Earlier, Bharti Airtel, Vodafone Essar and Aircel had announced the per-second tariff, intensifying the competition between operators.

RCom's new plan is an extension of the 'Simply Reliance Plan' announced last month, offering single tariff rate across all services.

RCom has announced three tariff variants -- one paisa per second, Rs 1 for 3 minutes and 50 paise per minute -- effective November 5, 2009, the company said in a statement.

"We now extend the Simply Reliance initiative by offering two new products catering to varied customer needs with the same simplicity and unconditional transparency," RCom President Mahesh Prasad said.

As per the one paisa per second billing plan, all local and STD calls would be charged at one paise per second, while SMS (local and STD) would be charged at 50 paise.