Galaxy S21 Ultra 5GSilver • 512 GB • Dual Physical SIM + eSIM

(6,584 reviews)

£343.00

before trade-in

Save £1,457.00

Free delivery by 16 - 17 Jun

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Based on up to 100-points of inspection

Customer reviews for Galaxy S21 Ultra 5G

Overall rating

6,584 verified reviews

Rating details

Accessories
4.1/5
Appearance
4.4/5
Battery
4.1/5
Lens & Camera
4.5/5
Overall performance
4.3/5
Packaging
4.4/5
Shipping
4.6/5

Reviews

Klaudia Z.
Verified purchase
Reviewed 24/03/2026, United Kingdom.
Im not sure how to rate this as phone condition was excellent, delivery was quick and Im loving the experience with backmarket, but I don't like the phone itself as in this model of Samsung or maybe Samsung in general. I much more prefer my Huawei
Galaxy S21 Ultra 5G 256GB - Dark Blue - Unlocked
Galaxy S21 Ultra 5G 256GB - Dark Blue - 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
08/03/2026
Sean C.
Verified purchase
Reviewed 05/01/2026, United Kingdom.
Exactly as expected, and delivered the next day! The phone is very fast and no lag, as if new. A coupe motor marks to be expected in fair condition, well worth going for this condition given the look and performance.
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
02/01/2026
Dacey M.
Verified purchase
Reviewed 17/11/2025, United Kingdom.
so far it has gone far past all my expectations for a refurbished mobile absolutely fantastic quality it seemed to good to be true but it is thank you for the excellent service you are providing
Galaxy S21 Ultra 5G 256GB - Silver - Unlocked
Galaxy S21 Ultra 5G 256GB - Silver - Unlocked
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
31/10/2025
Kat H.
Verified purchase
Reviewed 19/10/2025, United Kingdom.
I've replaced the phone i already have like-for-like as I've been having issues with the display. My new phone came in perfect condition and the battery life is much better than my old one. Really impressed with the price and service, and a much more sustainable option than buying new
Galaxy S21 Ultra 5G 256GB - Black - Unlocked
Galaxy S21 Ultra 5G 256GB - Black - 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
05/10/2025
Ireneusz B.
Verified purchase
Reviewed 04/11/2023, United Kingdom.
I recently purchased a refurbished Samsung Galaxy S21 Ultra in excellent condition from backmarket.co.uk, and I couldn't be happier with my decision. The device looks and functions like brand new, and I got it at a fraction of the original price. The service was exceptional, with fast shipping. I highly recommend buying refurbished electronics from this site, and my Samsung S21 Ultra is a testament to the quality and value they provide. It's been a fantastic experience, and I'm thrilled with my purchase!
Galaxy S21 Ultra 5G 128GB - Silver - Unlocked
Galaxy S21 Ultra 5G 128GB - Silver - 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
20/10/2023
Lynne L.
Verified purchase
Reviewed 23/08/2023, United Kingdom.
I was dubious of buying a refurbished mobile phone, but I needn't of been. I bought a Samsung S21 Ultra in fair condition. Arrived, it looks like new, no marks or scatches etc. I have never transferred data before but the process was really easy , I used samsung smart switch app and google did the rest. Very pleased with my phone
Galaxy S21 Ultra 5G 256GB - Black - Unlocked
Galaxy S21 Ultra 5G 256GB - Black - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
11/08/2023
Darren J.
Verified purchase
Reviewed 30/06/2025, United Kingdom.
Great service and massive choice for my needs. Phone I bought was exactly as described. I paid £5 for next day and the phone arrived as promised. My first option for any tech when I need it. Thank you.
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Galaxy S21 Ultra 5G 128GB - Black - 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
16/06/2025

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

Durability
Overall performance
Camera
Screen quality

Phantom silverColour (official name)
1,58SAR body
Galaxy S21 Ultra 5GModel
108 megapixelsMain camera
NoFoldable
SM-G998B/DSManufacturer Ref
512 GBStorage
5GMobile network
7,56 cmWidth

The Galaxy S21 Ultra 5G remains one of Samsung's flagship smartphones, offering an impressive array of features and specifications. Launched in January 2021, this model is designed for users who demand high performance and exceptional camera capabilities.

Key features:

Release Date: January 2021
Display: 6.8-inch Dynamic AMOLED 2X, QHD+ resolution
Processor: Exynos 2100 (International) / Snapdragon 888 (USA)
Camera: Quad-camera system with 108MP main sensor
Connectivity: 5G compatible for ultra-fast internet speeds.

Who is this for?

The Galaxy S21 Ultra 5G is ideal for professionals, content creators, and tech enthusiasts who require a powerful device for multitasking and high-quality photography. Its expansive display and advanced camera features make it a great choice for anyone who enjoys media consumption or photography on the go.

Pros & Cons:

Pros	Cons
Stunning display with vibrant colours and high resolution.	Large size may not be comfortable for one-handed use.
Exceptional camera performance for photography enthusiasts.	Premium price point compared to other models.

Why refurbished?

Choosing a refurbished Galaxy S21 Ultra 5G allows you to enjoy top-tier features while making an eco-conscious choice. Each device is thoroughly tested to meet high standards of quality and reliability. Learn more about our quality standards.

Colour (official name): Phantom silver
SAR body: 1,58
Model: Galaxy S21 Ultra 5G
Main camera: 108 megapixels
Foldable: No
Manufacturer Ref: SM-G998B/DS
Storage: 512 GB
Mobile network: 5G
Width: 7,56 cm
SAR body part: 2,56
Carrier compatibility: Unlocked
SD Card Slot: No
Screen size (in): 6.8
Weight: 227 g
Resolution: 1440 x 3200
Compatible with latest Update: Yes
Front camera: 40 megapixels
Memory (GB): 16 GB
OS: Android
Colour: Silver
Screen type: Dynamic AMOLED 2X
Serie: Samsung Galaxy S
Year of Release: 2021
Height: 16,15 cm
Depth: 0,89 cm
Brand: Samsung
SAR head: 0,714
SIM card: Dual Physical SIM + eSIM

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Galaxy S21 Ultra 5GSilver • 512 GB • Dual Physical SIM + eSIM

Galaxy S21 Ultra 5GSilver • 512 GB • Dual Physical SIM + eSIM

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Customer reviews for Galaxy S21 Ultra 5G

Overall rating

Rating details

Reviews

Reviews

Klaudia Z.

Sean C.

Dacey M.

Kat H.

Ireneusz B.

Lynne L.

Darren J.

Popular searches

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

Durability

Overall performance

Camera

Screen quality

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