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

Name: Galaxy S21 5G 128GB - Grey - Unlocked
Brand: Samsung
Price: 143.00 GBP
Availability: InStock

(18,961 reviews)

£143.00

before trade-in

Save £883.00

Free delivery by 10 - 11 Jun

Restored professionally

Based on up to 100-points of inspection

Customer reviews for Galaxy S21 5G

Overall rating

18,961 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

2021Year of Release
UnlockedCarrier compatibility
NoFoldable
128 GBStorage
AndroidOS
10 megapixelsFront camera
1080 x 2400Resolution
Galaxy S21 5GModel
6.2Screen size (in)

The Galaxy S21 5G is a flagship smartphone from Samsung, released in January 2021. This model features a sleek design and advanced capabilities, making it suitable for users who appreciate both style and performance.

Key features:

Display: 6.2-inch Dynamic AMOLED 2X, FHD+ resolution
Processor: Exynos 2100 (or Snapdragon 888, depending on the region)
Camera: Triple rear cameras with a 12MP ultra-wide, 12MP wide, and 64MP telephoto lens
Connectivity: 5G compatible for fast data speeds
Operating System: Ships with Android 11, upgradable to the latest versions

Who is this for?

The Galaxy S21 5G is ideal for professionals, content creators, and everyday users looking for a powerful smartphone with a versatile camera system. It suits those who enjoy streaming, gaming, and photography, providing a balanced experience compared to newer models like the Galaxy S22.

Pros & Cons:

Pros	Cons
High-quality display with vibrant colours and deep blacks.	No expandable storage option.
Solid camera performance in various lighting conditions.	Battery life may not last as long as newer models.

Why refurbished?

Choosing a refurbished Galaxy S21 5G allows you to access premium features while being environmentally conscious. Each device is rigorously tested to ensure quality and reliability. Learn more about our quality standards.

Year of Release: 2021
Carrier compatibility: Unlocked
Foldable: No
Storage: 128 GB
OS: Android
Front camera: 10 megapixels
Resolution: 1080 x 2400
Model: Galaxy S21 5G
Screen size (in): 6.2
Main camera: 12 megapixels
SAR head: 0.46
SAR body: 1.51
Weight: 171 g
Compatible with latest Update: Yes
Manufacturer Ref: SM-G991B
Memory (GB): 8 GB
Colour (official name): Phantom Gray
Camera Type: Triple (3x)
SIM card: Physical SIM + eSIM
Colour: Grey
Screen type: Dynamic AMOLED 2X
Connector: USB-C
Serie: Samsung Galaxy S
Brand: Samsung
Mobile network: 5G
SD Card Slot: No

Choose location

Suggested searches

Popular searches

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

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

Restored professionally

Comes with

Often bought together

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 Galaxy S23 Ultra review (2025) | Back Market

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

Samsung Galaxy S26 review | Back Market

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

Which Samsung A series phone is the best? Your ultimate guide to smart, refurbished choices in 2025 | Back Market

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

How to factory reset a Samsung phone | Back Market

Welcome to Back Market