Galaxy S21 5GBlack • 128 GB • Physical SIM + eSIM

(18,724 reviews)

£365.00

before trade-in

Free delivery by 16 - 17 Jun

Restored professionally

Based on up to 100-points of inspection

Customer reviews for Galaxy S21 5G

Overall rating

18,724 verified reviews

Rating details

Accessories
4.1/5
Appearance
4.5/5
Battery
4/5
Lens & Camera
4.5/5
Overall performance
4.2/5
Packaging
4.5/5
Shipping
4.6/5

Reviews

Al B.
Verified purchase
Reviewed 17/04/2026, United Kingdom.
Phone is in excellent condition, much better than i was expecting, I can't find a single scratch on the phone, working great, came well packaged, quick shipping to Ireland, I highly recommend this site 🌟🌟🌟🌟🌟
Galaxy S21 5G 128GB - Purple - Unlocked
Galaxy S21 5G 128GB - Purple - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
14/04/2026
Matthew S.
Verified purchase
Reviewed 26/04/2026, United Kingdom.
I was a little nervous to order a refurbished phone but I've gotta say this honestly feels like brand new! There's only minor signs of wear and tear on the main body but other than that it's pretty much perfect!
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - Grey - Unlocked
Condition
Excellent
Almost no signs of wear. The body may have very light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
13/04/2026
Jenny B.
Verified purchase
Reviewed 08/06/2026, United Kingdom.
Condition said it was fair but its near on perfect. Bought for my mum who is in her 80s, easy for her to navigate her way round and easy for her to use. This is the 3rd time buying from this site, wouldn't buy phones from anywhere else now. Thankyou. 😀
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - Grey - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
24/05/2026
Colette A.
Verified purchase
Reviewed 25/05/2026, United Kingdom.
Fantastic. Delivered quicker than date advised and although the product was said to be in fair condition, I would describe it as excellent! Have used back market a couple of times now and have advised others to do the same.
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - Grey - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
11/05/2026
Elaine T.
Verified purchase
Reviewed 15/03/2026, United Kingdom.
Perfect as usual this is the 3rd phone I've bought from backmarket.co.uk S25 ultra for myself, S22 for older granson and the S21 for younger granson and they have all came in amazing condition and work perfectly. I will never again get a phone on contract after learning about backmarket. 🥰👌🥰
Galaxy S21 5G 256GB - Grey - Unlocked
Galaxy S21 5G 256GB - Grey - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
28/02/2026
Edward P.
Verified purchase
Reviewed 21/07/2025, United Kingdom.
I have used black market for my wife's and my last three phones. every time the phones have been in perfect condition and worked with no problems at all. I have just bought a duel sim phone Galaxy S21 5G because I used one sim for Internet at my caravan and normal sim for phone. works perfect for me.
Galaxy S21 5G 128GB - White - Unlocked
Galaxy S21 5G 128GB - White - Unlocked
Condition
Excellent
Almost no signs of wear. The body may have very light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
05/07/2025
Dawn W.
Verified purchase
Reviewed 06/06/2025, United Kingdom.
Fabulous phone, arrived very quickly, chose a refurbished s21 and the condition is amazing I love it I've used back market before and I'll be using it in the future as well as recommending it to everyone I know 👌
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - Grey - Unlocked
Condition
Excellent
Almost no signs of wear. The body may have very light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
22/05/2025

Everything you ever wanted to know about the Galaxy S21 5G

Durability
Overall performance
Camera
Screen quality

USB-CConnector
BlackColour (official name)
10 megapixelsFront camera
NoFoldable
2021Year of Release
Triple (3x)Camera Type
5GMobile network
AndroidOS
8 GBMemory (GB)

The Galaxy S21 5G stands out as a solid flagship smartphone from Samsung, offering a blend of premium features and a sleek design. Released in January 2021, it continues to be a reliable option for users seeking a high-performance device.

Key features:

Release Date: January 2021
Display: 6.2-inch Dynamic AMOLED 2X, FHD+ resolution
Processor: Exynos 2100 (International) / Snapdragon 888 (USA)
Camera: Triple rear cameras including a 12MP ultra-wide and 64MP telephoto lens
Connectivity: 5G compatible, ensuring fast downloads and low-latency performance.

Who is this for?

The Galaxy S21 5G is ideal for professionals and tech enthusiasts who require a powerful smartphone for multitasking, photography, and streaming. Its compact design makes it suitable for users who prefer a device that fits comfortably in hand or pocket.

Pros & Cons:

Pros	Cons
Vibrant display with excellent colour accuracy.	No expandable storage option available.
Strong camera performance in various lighting conditions.	Plastic back may feel less premium compared to glass alternatives.

Why refurbished?

Choosing a refurbished Galaxy S21 5G is an excellent way to access high-end features without purchasing a brand-new device. Each phone is thoroughly tested to ensure it meets Back Market’s quality standards. Learn more about our quality standards.

Connector: USB-C
Colour (official name): Black
Front camera: 10 megapixels
Foldable: No
Year of Release: 2021
Camera Type: Triple (3x)
Mobile network: 5G
OS: Android
Memory (GB): 8 GB
Screen type: Dynamic AMOLED 2X
SIM card: Physical SIM + eSIM
Screen size (in): 6.2
Compatible with latest Update: Yes
Weight: 340 g
Resolution: 1080 x 2400
Serie: Samsung Galaxy S
Storage: 128 GB
Main camera: 12 megapixels
Colour: Black
SAR head: 0.46
Model: Galaxy S21 5G
Carrier compatibility: Unlocked
Brand: Samsung
SD Card Slot: No
SAR body: 1.51

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Galaxy S21 5GBlack • 128 GB • Physical SIM + eSIM

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Customer reviews for Galaxy S21 5G

Overall rating

Rating details

Reviews

Reviews

Al B.

Matthew S.

Jenny B.

Colette A.

Elaine T.

Edward P.

Dawn W.

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Everything you ever wanted to know about the Galaxy S21 5G

Durability

Overall performance

Camera

Screen quality

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