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

Name: Galaxy S21 Ultra 5G 512GB - Black - Unlocked
Brand: Samsung
Price: 276.99 GBP
Availability: InStock
Rating: 4.29 (6655 reviews)

(6,655 reviews)

£276.99

before trade-in

Save £1,162.01

Free delivery by 9 - 10 Sept

Restored professionally

Based on up to 100-points of inspection

Customer reviews for Galaxy S21 Ultra 5G

Overall rating

6,655 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

Javed S.
Verified purchase
Reviewed 07/04/2025, United Kingdom.
Ordered a "Good" quality Samsung Galaxy S21 Ultra 5g phone and surprised as its almost like a brand new phone apart from a few cosmetic dints which were expected I suppose. Still to find out how battery performs over time but my wife is quiet impressed with the phone. Would definitely buy another phone from here as they've kept the word on quality of the phone. Keep up the good work and help the planet.
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
23/03/2025
Blacklab M.
Verified purchase
Reviewed 27/08/2026, United Kingdom.
I orderedva premium level mobile. It looks and feels brand new. Arrived on time with plenty of tracking info. So far I am very pleased. This is the first time that I have purchased a refurbished item.
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Condition
Premium
Close to perfection. The body may have tiny micro-scratches. For items with screens, the screen will be flawless.
Purchased
19/08/2026
Peter H.
Verified purchase
Reviewed 14/07/2026, United Kingdom.
was very pleased with my phone Samsung galaxy S21 ultra. Condition was very good and battery life seems to be excellent far exceeding my expectation as suppliers description was good. The actual purchase was straight forward and delivery was very timely . Could not be more pleased
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Galaxy S21 Ultra 5G 128GB - Black - 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
06/07/2026
Aidas A.
Verified purchase
Reviewed 27/03/2025, United Kingdom.
I ordered samsung s21 ultra,and it comes in very good condition. There are no scratches on the phone at all. It works like a new one . I would recommend to everyone it's better to buy refurbished on a half price than pay full price at store for a new one.
Galaxy S21 Ultra 5G 512GB - Black - Unlocked
Galaxy S21 Ultra 5G 512GB - Black - Unlocked
Condition
Premium
Close to perfection. The body may have tiny micro-scratches. For items with screens, the screen will be flawless.
Purchased
11/03/2025
Hakim A.
Verified purchase
Reviewed 13/05/2026, United Kingdom.
It is so far the best experience I had with a refurbished phone it is absolutely stunning the quality is Immaculate and the service has been fast Safe and efficient. I have recommended Back Market to my friend who bought a phone for his wife I also highly recommend this seller to anyone who wants a very good phone at a fraction of the price.
Galaxy S21 Ultra 5G 128GB - Silver - Unlocked
Galaxy S21 Ultra 5G 128GB - 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
25/04/2026
Stephanie W.
Verified purchase
Reviewed 15/04/2026, United Kingdom.
Absolutely brilliant phone. I am very happy with my purchase. Samsung galaxy s21 ultra. The phone arrived in perfect condition and although I requested a phone in" good condition" I can't tell the difference from a brand new one. I would highly recommend Back market to anyone.
Galaxy S21 Ultra 5G 256GB - Dark Blue - Unlocked
Galaxy S21 Ultra 5G 256GB - Dark Blue - 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
11/04/2026
Richard M.
Verified purchase
Reviewed 15/06/2026, United Kingdom.
unfortunately I have locked myself out of the phone. I have given it to technicians and am waiting for them to get me back into it. as soon as I get it back I will transfer my data and send it on to you. I think that will be the middle of next week
Galaxy S21 Ultra 5G 128GB - Silver - Unlocked
Galaxy S21 Ultra 5G 128GB - 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
01/06/2026

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

Durability
Overall performance
Camera
Screen quality

0,89 cmDepth
BlackColour
512 GBStorage
Galaxy S21 Ultra 5GModel
0,714SAR head
NoSD Card Slot
108 megapixelsMain camera
NoFoldable
227 gWeight

The Samsung Galaxy S21 Ultra 5G is a flagship smartphone that showcases Samsung's commitment to innovation and high performance. Released in January 2021, it remains a top choice for users seeking a premium experience with advanced features.

Key features:

Display: 6.8-inch Dynamic AMOLED 2X, QHD+ resolution
Processor: Exynos 2100 (international) / Snapdragon 888 (USA)
Camera: Quad-camera system with a 108MP wide lens, 12MP ultra-wide, and dual 10MP telephoto lenses
Connectivity: 5G compatible, ensuring ultra-fast downloads and low-latency performance
Operating System: Ships with Android 11, upgradable to the latest versions

Who is this for?

The Samsung Galaxy S21 Ultra 5G is ideal for professionals, content creators, and tech enthusiasts who demand high-quality photography, powerful performance, and a stunning display. It’s perfect for users who want the best multimedia experience and multitasking capabilities in a smartphone.

Pros & Cons:

Pros	Cons
Exceptional camera quality with versatile shooting options.	Large size may not be comfortable for all users.
Stunning display with high refresh rate.	No expandable storage option available.

Why refurbished?

Choosing a refurbished Samsung Galaxy S21 Ultra 5G allows you to enjoy flagship features while being eco-conscious. Back Market ensures each device undergoes rigorous testing to meet high-quality standards. Learn more about our quality standards.

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

Choose location

Suggested searches

Popular searches

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

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

Restored professionally

Comes with

Often bought together

Customer reviews for Galaxy S21 Ultra 5G

Overall rating

Rating details

Reviews

Reviews

Javed S.

Blacklab M.

Peter H.

Aidas A.

Hakim A.

Stephanie W.

Richard M.

Popular searches

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

Durability

Overall performance

Camera

Screen quality

Related articles

iPhone vs Samsung Galaxy: Which is best for you? | Back Market

Samsung Galaxy S23 Ultra review (2025) | Back Market

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

iPhone 15 vs. Galaxy S24 series: Battle of brains, lenses, and next-gen power | Back Market

Best Galaxy smartphones: From deluxe to budget | Back Market

Samsung S24 series tech specs (S24, S24+, S24 FE, S24 Ultra) | Back Market

Samsung Galaxy S22: Price, Release Date and Technical Specifications | Back Market

Welcome to Back Market