As per the post on the official Facebook page of Asus India, the maker will be providing Rs 1,500 off when you exchange your old phone to purchase a Zenfone 4 or Zenfone 5. Like before, the Zenfone models are available exclusively via the e-commerce portal Flipkart and you can check if your phone is eligible for exchange via the Exchange Offer form on the listing before purchasing the device. This way, you can purchase the Zenfone 4 A400CG priced at Rs 5,999 for Rs 4,999 and Zenfone 4 A400CXG costing Rs 5,899 can be purchased for Rs 4,899 respectively. Also, the 8 GB variant of Zenfone 5 will cost Rs 8,499 instead of Rs 9,999 on exchange, while the 16 GB variant can be grabbed for Rs 11,499 rather than Rs 12,999.