Samsung Galaxy S21 smartphone comes with a 6.20-inch touchscreen display with a resolution of 1080×2400 pixels at a pixel density of 421 pixels per inch (ppi) and an aspect ratio of 20:9. Samsung Galaxy S21 is powered by a 2.2GHz octa-core Samsung Exynos 2100 processor that features 3 cores clocked at 2.8GHz, 4 cores clocked at 2.2GHz and 1 core clocked at 2.9GHz. It comes with 8GB of RAM. The Samsung Galaxy S21 runs Android 11 and is powered by a 4000mAh battery. The Samsung Galaxy S21 supports wireless charging, as well as proprietary fast charging. As far as the cameras are concerned, the Samsung Galaxy S21 on the rear packs a triple camera setup featuring a 12-megapixel primary camera with an f/1.8 aperture and a pixel size of 1.8-micron; a 12-megapixel camera with an f/2.2 aperture and a pixel size of 1.4-micron, and a 64-megapixel camera with an f/2.0 aperture and a pixel size of 0.8-micron. The rear camera setup has autofocus. It has a single front camera setup for selfies, featuring a 10-megapixel sensor with an f/2.2 aperture and a pixel size of 1.22-micron. The Samsung Galaxy S21 runs One UI 3.1 is based on Android 11 and packs 256GB of inbuilt storage. The Samsung Galaxy S21 is a dual-SIM (GSM and GSM) smartphone that accepts Nano-SIM and Nano-SIM cards. The Samsung Galaxy S21 measures 151.70 x 71.20 x 7.90mm (height x width x thickness) and weighs 171.00 grams. It was launched in Phantom Violet colour. It features an IP68 rating for dust and water protection. Connectivity options on the Samsung Galaxy S21 include Wi-Fi 802.11 a/b/g/n/ac/Yes, GPS, Bluetooth v5.00, NFC, USB Type-C, 3G, and 4G & 5G. Sensors on the phone include accelerometer, ambient light sensor, barometer, compass/ magnetometer, gyroscope, proximity sensor, and in-display fingerprint sensor. The Samsung Galaxy S21 supports face unlock.