The Zero Hour is a term used by Flipkart to refer to a sale event where customers can get The Big Billion Days prices on the best smartphones before the Big Billion Days. It is a ticket to get sale prices on smartphones before the actual sale event. The Zero Hour is a sale event that takes place on Flipkart, and it is usually held before The Big Billion Days sale. During the Zero Hour sale, customers can purchase products at discounted prices. The sale event includes a wide range of products, including smartphones, electronics, fashion, and more. Customers can purchase products during the Zero Hour sale on Flipkarts website or mobile app.