Offer valid on Lumia 535, 540, 640, 640 XL, 730 and 430. Use code LUMIA300 to avail the offer. *T&C apply. Promo Code: LUMIA300 The offer can be redeemed over a period of 1 year, Rs. 300 per month. *T&C Apply. To Grab or more detail visit at http://www.microsoft.com/en-in/mobile/campaign-mobikwik-cashback/