Amazon’s five-day Smartphone Upgrade sale begun last weekend and will continue till April 15, i.e., tomorrow. The leading e-retailer is offering up to 40 percent discount on major smartphone brands including Apple, Samsung, OnePlus, Xiaomi, etc. While the offers are tempting, there is a good bunch of smartphones listed with discounts on the Smartphone Upgrade Days sale page. To avoid confusion, and help you with the buying decision we have listed some of the best offers across varied price range that you can check. It is worth mentioning that there is a few couple hours left for the sales to end, so better hurry before you miss it.