The Samsung Galaxy M31 is an Android smartphone manufactured by Samsung Electronics as part of the Galaxy M series. It was unveiled on 25 February 2020. Its key features include a 6.4 inch Super AMOLED display, a quad-camera setup and a 6000 mAh battery.

One UI is a user interface (UI) developed by Samsung Electronics for its Android devices running Android 9 "Pie" and later. Succeeding Samsung Experience and TouchWiz, it is designed to make using larger smartphones easier and be more visually appealing. To provide more clarity, some elements of the UI are tweaked to match colors that are based on the color of the user's phone. It was announced at Samsung Developer Conference in 2018, and was unveiled in Galaxy Unpacked in February 2019 alongside the Galaxy S10 series, Galaxy Buds and the Galaxy Fold.