Galaxy S21 5G

(18,980 reviews)

£136.00

before trade-in

Save £796.00

Free delivery by 16 - 17 Jun

Restored professionally

Based on up to 100-points of inspection

Often bought together

Galaxy S21 5G

Purple • 128 GB • Physical SIM + eSIM

Refurbished price:£136.00

Versus £932.00 new

Case Galaxy S21 5G and 2 protective screens - Silicone - Transparent

Refurbished price:£24.99

Total price: £160.99

These items might be sold and delivered by different sellers.

Pairs well with

Case Galaxy S21 5G and 2 protective screens - Silicone - TransparentBrand new
(159)
Refurbished price:£24.99
Case Galaxy S21 5G and 2 protective screens - TPU - BlueBrand new
(32)
Refurbished price:£24.99
Case Galaxy S21 5G and 2 protective screens - TPU - GreenBrand new
(11)
Refurbished price:£24.99
AirPods Pro 2 (2023)Excellent
(1,484)
Refurbished price:£137.00
AirPods Pro 2 (2024)Excellent
(1,304)
Refurbished price:£136.00
AirPods 2 (2019)Excellent
(15,321)
Refurbished price:£77.00
AirPods Max (2024)Excellent
(185)
Refurbished price:£365.00
AirPods Pro 2 (2022)Excellent
(941)
Refurbished price:£146.00
AirPods 3 (2021)Excellent
(3,074)
Refurbished price:£79.00
AirPods 4 (ANC) (2024)Excellent
(599)
Refurbished price:£113.00
AirPods Pro 1 (2021)Good
(7,717)
Refurbished price:£87.00

Customer reviews for Galaxy S21 5G

Overall rating

18,980 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
See item
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
See item
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
See item
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
See item
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
See item
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
See item
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
See item
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

Triple (3x)Camera Type
10 megapixelsFront camera
169 gWeight
SamsungBrand
5GMobile network
0.46SAR head
AndroidOS
SM-G991UManufacturer Ref
PurpleColour

The Galaxy S21 5G is a flagship smartphone from Samsung that continues to impress with its robust features and sleek design. Released in January 2021, this model is still relevant in today’s tech landscape, offering a blend of performance and style that appeals to a wide range of users.

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 with 12MP ultra-wide, 12MP wide, and 64MP telephoto lenses
Connectivity: 5G compatible for fast internet speeds.

Who is this for?

The Galaxy S21 5G is ideal for tech enthusiasts, professionals, and casual users who seek a high-performing smartphone with excellent camera capabilities. It’s particularly suited for those who enjoy photography and media consumption, thanks to its vibrant display and versatile camera system.

Pros & Cons:

Pros	Cons
Stunning display with excellent colour accuracy.	No expandable storage option available.
Versatile camera system for various photography needs.	Average battery life compared to some competitors.

Why refurbished?

Choosing a refurbished Galaxy S21 5G allows you to access premium features while being eco-conscious. Each device undergoes thorough testing and quality assurance to ensure reliability. Learn more about our quality standards.

Camera Type: Triple (3x)
Front camera: 10 megapixels
Weight: 169 g
Brand: Samsung
Mobile network: 5G
SAR head: 0.46
OS: Android
Manufacturer Ref: SM-G991U
Colour: Purple
Screen type: Dynamic AMOLED 2X
Carrier compatibility: Unlocked
Colour (official name): Phantom violet
Screen size (in): 6.2
Model: Galaxy S21 5G
SIM card: Physical SIM + eSIM
SAR body: 1.51
Main camera: 12 megapixels
Connector: USB-C
Serie: Samsung Galaxy S
Memory (GB): 8 GB
Storage: 128 GB
SD Card Slot: No
Foldable: No
Year of Release: 2021
Compatible with latest Update: Yes
Resolution: 1080 x 2400

Welcome to Back Market

The best prices for high-quality renewed goods by sellers we’ve checked and vetted. We don’t mind if you Google us.

Get to know us

1-year minimum warranty
Free delivery on all items
Free 30-day returns
Excellent customer support

Choose location

Suggested searches

Popular searches

Galaxy S21 5G

Restored professionally

Comes with

Often bought together

You may also like

Pairs well with

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.

Popular searches

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

Durability

Overall performance

Camera

Screen quality

Related articles

Samsung vs iPhone: which one is right for you? | Back Market

Samsung Galaxy s10 vs. Samsung Galaxy s10+ : Which One Should You Buy? | Back Market

Samsung Galaxy S25 series review: Is it worth it? | Back Market

Samsung Galaxy S23 Ultra review (2025) | Back Market

Samsung Galaxy S24 series review: Is it still worth it in 2025? | Back Market

Samsung S24 series colour guide: Every shade and finish explained | Back Market

Samsung Galaxy S26 review | Back Market

Welcome to Back Market