While prepaid tariff plans continue to get better every day, Airtel is trying its best to retain the postpaid users. The Sunil Mittal-led company is now offering up to Rs 100 discount on the Airtel Postpaid plans. This rental discount is valid for six months. Apart from the base Rs 399 myPlan Infinity Postpaid Plan, all Airtel postpaid plans are eligible for Rs 100 rental discount for six months. This rental discount brings down the price of the monthly rental, allowing customers to stay in the postpaid. With the Rs 399 Airtel myPlan Infinity postpaid plan, Airtel is offering Rs 50 rental discount for six months. So the price of the Rs 399 plan will be Rs 349 for the next six months excluding the taxes. And Airtel is providing Rs 100 rental discount on Rs 499, Rs 799, and Rs 1199 postpaid plans, meaning the monthly rental of these plans come down to Rs 399, Rs 699, and Rs 1099, respectively. And the best part is the rental discount is valid for six months, not for o...