The Smart Exchange offer is valid from till April 15, 2015 or till stocks last across the country, giving existing consumers of Asha 500, Asha 501, Asha 502 and Asha 503 an assured discount of Rs. 1,500/- and an assured discount of Rs. 1,000/- for Asha 305, Asha 306, Asha 308, Asha 309, Asha 310 and Asha 311 consumers. This discount is applicable on MRP of Lumia 435 which is Rs. 5,999/-.