Free delivery by 13 - 16 Nov
Items
Suggested searches
Recent
All guaranteed 100% functional
1 / 3.
1 / 3.
Galaxy S21 5G
- Fair
- 128 GB
- Physical SIM + eSIM
- Grey
£164.00
before trade-in
applies (starting at £0.49)
Save £862.00
Proudly refurbished by ITSWORTHMORE Limited
Free delivery by 13 - 16 Nov
Comes with
Compatible charging cable
Often bought together
Galaxy S21 5G
Grey • 128 GB • Physical SIM + eSIM
Refurbished price:£164.00
£1,026.00 newVersus £1,026.00 new
Total price: £185.99
These items might be sold and delivered by different sellers.
Customer reviews for Galaxy S21 5G
Overall rating
4.3/54.3/519,404 verified reviewsRating 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
Reviews
Al B.
Verified purchaseReviewed 17/04/2026, United Kingdom.
5/5Phone 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
Purchased
14/04/2026
Maryam H.
Verified purchaseReviewed 12/04/2026, United Kingdom.
4.8/5Nice phone nice quality nice delivery, 90% batrie
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - Grey - Unlocked
Condition
Good
Purchased
31/03/2026
Patrick M.
Verified purchaseReviewed 13/12/2025, United Kingdom.
5/5This phone came in excellent condition like they said the quality is just amazing!
Galaxy S21 5G 128GB - Grey - Unlocked
Galaxy S21 5G 128GB - Grey - Unlocked
Condition
Excellent
Purchased
12/12/2025
Denise R.
Verified purchaseReviewed 18/06/2026, United Kingdom.
5/5phone was in great condition looked like a new phone and I liked the colour only draw back was after setting it up had to give it at least 8 software updates now phone is working like it should but I would still buy another phone from this company if I needed one their alot cheaper than some of these shops that sell used phones
Galaxy S21 5G 128GB - Purple - Unlocked
Galaxy S21 5G 128GB - Purple - Unlocked
Condition
Excellent
Purchased
02/06/2026
Jenny L.
Verified purchaseReviewed 23/09/2026, United Kingdom.
4.9/5It's like brand new I couldn't find a single mark. Straight forward to use. The only thing is the battery It's not new didn't have the option at the time so doesn't last long. Overall very pleased definitely recommend Back Market 👍
Galaxy S21 5G 256GB - Grey - Unlocked
Galaxy S21 5G 256GB - Grey - Unlocked
Condition
Fair
Purchased
04/09/2026
Michaela E.
Verified purchaseReviewed 01/07/2026, United Kingdom.
5/5Phone was in pristine condition. All working great up to now as well. Fast delivery and quick service.
Galaxy S21 5G 128GB - Pink - Unlocked
Galaxy S21 5G 128GB - Pink - Unlocked
Condition
Premium
Purchased
18/06/2026
Elaine T.
Verified purchaseReviewed 15/03/2026, United Kingdom.
5/5Perfect 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
Purchased
28/02/2026
Popular searches
Everything you ever wanted to know about the Galaxy S21 5G
Durability
Overall performance
Camera
Screen quality
SamsungBrand
GreyColour
Physical SIM + eSIMSIM card
10 megapixelsFront camera
Triple (3x)Camera Type
UnlockedCarrier compatibility
128 GBStorage
USB-CConnector
8 GBMemory (GB)
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
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.
- Brand
- Samsung
- Colour
- Grey
- SIM card
- Physical SIM + eSIM
- Front camera
- 10 megapixels
- Camera Type
- Triple (3x)
- Carrier compatibility
- Unlocked
- Storage
- 128 GB
- Connector
- USB-C
- Memory (GB)
- 8 GB
- SD Card Slot
- No
- Model
- Galaxy S21 5G
- Foldable
- No
- Mobile network
- 5G
- Serie
- Samsung Galaxy S
- OS
- Android
- Colour (official name)
- Phantom Gray
- Compatible with latest Update
- Yes
- Year of Release
- 2021
- Manufacturer Ref
- SM-G991B
- Weight
- 171 g
- Resolution
- 1080 x 2400
- Screen type
- Dynamic AMOLED 2X
- Screen size (in)
- 6.2
- SAR body
- 1.51
- SAR head
- 0.46
- Main camera
- 12 megapixels
Galaxy S21 5G
Related articles
GeneralI swapped my smartphone for a dumbphone for a week and was surprised by the result | Back Market
SamsungiPhone 15 vs. Galaxy S24 series: Battle of brains, lenses, and next-gen power | Back Market
SamsungSamsung Galaxy S24 vs. Google Pixel 8: How these Androids compare | Back Market
SamsungiPhone vs Samsung Galaxy: Which is best for you? | Back Market
Samsung TabHow to reset a Samsung tablet: Easy Guide | Back Market
Black Friday buying guidesWhen is Black Friday 2026? Your guide to the best deals and shopping tips | Back Market
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
product-page-e2e-translation-check-en-gb