Calls can now cost as low as 0.4 paise per second and this would be available on local, as well as domestic long distance (STD) calls, the company said in a statement here.
This can put further pressure on the revenue of mobile firms after the companies introduced a per second pulse.
At present, Uninor services are available in 13 circles of UP (East and West), Bihar, Orissa, Kolkata, West Bengal, Tamil Nadu, Karnataka, Kerala, Andhra Pradesh, Mumbai, Maharashtra and Gujarat.
The company has a pan-India licence. Telenor has a majority stake of over 67 per cent in the joint venture.
The new tariff, called Dynamic Pricing, would be available on a recharge tariff of Rs 26 with a validity of three months.
Going by the maximum discount offered by the company, a one-minute call could cost as low as 24 paise compared to 60 paise charged by other operators.
Different discounts across different locations are possible for companies as they can save on paying termination charges to another operator in case the call is on the same network.
The discount would be maximum whenever a call is on the same network.