Samsung Galaxy M31s smartphone was launched on 30th July 2020. The phone comes with a 6.50-inch touchscreen display with a resolution of 1080x2400 pixels and an aspect ratio of 20:9. Samsung Galaxy M31s is powered by an octa-core Samsung Exynos 9611 processor. It comes with 6GB of RAM. The Samsung Galaxy M31s runs Android 10 and is powered by a 6000mAh non-removable battery. The Samsung Galaxy M31s supports proprietary fast charging.

As far as the cameras are concerned, the Samsung Galaxy M31s on the rear packs a 64-megapixel primary camera with an f/1.8 aperture; a second 12-megapixel camera with an f/2.2 aperture; a third 5-megapixel camera with an f/2.4 aperture and a fourth 5-megapixel camera with an f/2.4 aperture. The rear camera setup has autofocus. It sports a 32-megapixel camera on the front for selfies, with an f/2.2 aperture.

The Samsung Galaxy M31s runs One UI based on Android 10 and packs 128GB of inbuilt storage. The Samsung Galaxy M31s is a dual-SIM (GSM and GSM) smartphone that accepts Nano-SIM and Nano-SIM cards. It was launched in Mirage Black and Mirage Blue colours.

Connectivity options on the Samsung Galaxy M31s include Wi-Fi 802.11 a/b/g/n/ac, GPS, Bluetooth v5.00, 3G, and 4G (with support for Band 40 used by some LTE networks in India). Sensors on the phone include accelerometer, ambient light sensor, gyroscope, proximity sensor, and fingerprint sensor. The Samsung Galaxy M31s supports face unlock.