Samsung Galaxy M31s used and refurbished

The Galaxy M31s stands out in the M series with a screen that has no notch at the top – the selfie camera sits in a small punch-hole, leaving the rest of the 6.5-inch Super AMOLED panel for content. Underneath is a 6000 mAh battery that you charge at 25 W. It's a 2020 phone for anyone who watches a lot, types a lot and hates seeing the battery indicator turn red in the evening.

At SWOPiFY you'll find used and refurbished Samsung Galaxy M31s phones in the 128 GB version with 6 GB of RAM, in black and blue. SWOPiFY partners test every unit before it's sold, and any that need work are sent to a repair service first.

What can the Galaxy M31s do?

The panel has a resolution of 2400 x 1080 pixels and a 20:9 aspect ratio, so it's tall and narrow – comfortable for scrolling and reading long messages. Colours are vivid and blacks are truly black. The front glass is Gorilla Glass 3. Sound comes from a single speaker, which is fine for calls and YouTube videos, but won't replace a Bluetooth speaker.

The plastic back has a gradient finish that changes shade depending on the angle. There's no water resistance. The fingerprint scanner is tucked into the power button on the right-hand side – you wake and unlock the M31s with a single touch. NFC in the European version lets you pay contactlessly.

Processor, cameras and battery

Inside is the Exynos 9611 with 6 GB of RAM. Today it's a lower-end processor: social media, online shopping, banking and navigation will run, while demanding games need the detail turned down. On the back there's a 64 MP main camera, a 12 MP ultra-wide, a 5 MP macro and a 5 MP depth sensor. The Single Take feature records a short clip and, from one press of the shutter, gives you several photos and videos to choose from. Selfies are handled by a 32 MP camera.

The 6000 mAh battery and 25 W wired charging are the best pairing in this phone. Over a USB-C cable you can also top up another phone or your earbuds – at 4.5 W. There's no wireless charging.

What should you check before buying?

The 3.5 mm headphone jack is there, and the microSD card has its own tray, so it doesn't take the second SIM's place. The screen runs at 60 Hz. You'll get the full 25 W with a charger that supports Samsung Super Fast Charging (USB-C PD with PPS). With an old 5 V adapter, charging will take noticeably longer.

Updates ended with Android 12 and One UI 4.1. The last software release for this model came out in October 2024, so the phone hasn't received security patches for two years. It's not the best choice for your main banking app, but as a backup phone, a media player or a smartphone for an older relative to make calls and take photos, it still makes sense. The Galaxy M31 has almost the same set-up, with a notch in the screen, a fingerprint reader on the back and 15 W charging.

You can filter Galaxy M31s listings by:

• storage – 128 GB;
• RAM – 6 GB;
• colour;
• price range;
• condition.

When choosing a unit, pay attention to the battery's condition grade. With a phone people buy mainly for battery life, it's better to pay a bit more for a unit in a higher grade.

What does the technical check involve?

Before a Galaxy M31s goes on sale as refurbished, it goes through a 44-point checklist, including:

• screen – touch response, brightness, discolouration and scratches on the glass;
• battery – remaining capacity and the condition of the cell casing;
• all four rear cameras and the front camera in the punch-hole;
• the fingerprint reader in the power button;
• Wi-Fi, Bluetooth, GPS and NFC;
• the SIM and microSD tray;
• speaker, microphone, headphone jack and USB-C port with fast charging.

Can you trust a refurbished Galaxy M31s?

A refurbished Samsung Galaxy M31s from SWOPiFY is a used phone that has been technically checked and, if needed, repaired by a SWOPiFY partner. Nobody pretends it's new – neither in the description nor in the listing.

You get it with a warranty. The condition grades – Premium, Excellent, Good and Fair – describe the look of the casing and the health of the battery, so you choose with your eyes open: either a phone with hardly any marks, or a cheaper unit with scratches that don't affect how it works.

Got an old smartphone you no longer use?

Our trade-in programme lets you swap it for a lower price on your next purchase. We value the phone, and you save yourself arranging meetings with buyers from ads.

Browse the available Galaxy M31s phones and choose the colour that suits you.