Samsung Galaxy M33 5G: Samsung Galaxy M33 is the number one smartphone under Rs 20,000. For many reasons, this smartphone can be a great option for you. Talking about some of the features of Galaxy M33, the company has given it a large 6.6-inch display, which supports 1080 x 2400 pixels resolution. For performance, the company has used Exynos 1280 octa core chipset in it. 128GB storage option is available in this smartphone along with 8GB RAM. The company has given a quad camera setup at the back. If you want, you can buy this smartphone from Amazon for Rs 16,999.