Galaxy S21 Ultra 5GDark grey • 256 GB • Dual Physical SIM + eSIM

Name: Galaxy S21 Ultra 5G 256GB - Dark Grey - Unlocked
Brand: Samsung
Price: 292.00 GBP
Availability: InStock

(6,226 reviews)

£292.00

before trade-in

Save £1,286.00

Free delivery by 25 - 26 Jun

Restored professionally

Based on up to 100-points of inspection

Customer reviews for Galaxy S21 Ultra 5G

Overall rating

6,226 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
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
Deivids S.
Verified purchase
Reviewed 04/03/2026, United Kingdom.
Much better than previous phone, this time rear camera was refurbished right and auto focused without the onbnoxious manual tapping. Battery is solid so far and minimal scratches all for a good price :)
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
19/02/2026
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
Andrea N.
Verified purchase
Reviewed 31/05/2026, United Kingdom.
my device was just as described, however within a few days it was clear it had a fault with mobile data. I contacted back market via help section. I received an identical phone the next day, and once my new phone had been updated I returned the faulty one. I was amazed how easy the issue I had was felt with and sorted. excellent service and the phone is working as it should.
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
19/05/2026
Keith H.
Verified purchase
Reviewed 25/05/2026, United Kingdom.
We had a device delivered and it wasn't working as it should, we were away on holiday and it turned itself off and wouldn't restart. I emailed Back market and they sent out a replacement within 24 hours. Excellent customer service, we will certainly recommend and use them again.
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
14/05/2026
Michelle G.
Verified purchase
Reviewed 24/05/2026, United Kingdom.
First time I’ve ever bought from Back Market & have to honestly say the service was fantastic. The phone I got was in excellent condition, the delivery service was quick and can’t fault the company what so ever. Will definitely recommend to friends & will be using this company for my next purchase. Thank you again for amazing service.
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
09/05/2026

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

Durability
Overall performance
Camera
Screen quality

5GMobile network
12 GBMemory (GB)
6.8Screen size (in)
Dual Physical SIM + eSIMSIM card
Galaxy S21 Ultra 5GModel
SamsungBrand
UnlockedCarrier compatibility
256 GBStorage
Dark greyColour

The Galaxy S21 Ultra 5G is a flagship smartphone from Samsung that was released in January 2021. It features a premium design and top-of-the-line specifications, making it an excellent choice for users who demand high performance and advanced camera capabilities.

Key features:

Release Date: January 2021
Display: 6.8-inch Dynamic AMOLED 2X, QHD+ resolution
Processor: Exynos 2100 (International) or Snapdragon 888 (USA)
Camera: Quad-camera system with 108MP wide lens, 12MP ultra-wide, and dual 10MP telephoto lenses
Connectivity: 5G compatible for ultra-fast connectivity and low-latency performance.

Who is this for?

The Galaxy S21 Ultra 5G is ideal for professionals, photographers, and tech enthusiasts who require a powerful device with exceptional camera capabilities and a stunning display. Its advanced features make it suitable for content creators and users who enjoy gaming and multimedia consumption.

Pros & Cons:

Pros	Cons
Stunning display with vibrant colours and high refresh rate.	Large and heavy design may not be comfortable for all users.
Exceptional camera system for versatile photography.	High price point compared to other models.

Why refurbished?

Choosing a refurbished Galaxy S21 Ultra 5G allows you to enjoy premium features while being eco-conscious. Each device is thoroughly tested to ensure quality and reliability, meeting Back Market's high standards. Learn more about our quality standards.

Mobile network: 5G
Memory (GB): 12 GB
Screen size (in): 6.8
SIM card: Dual Physical SIM + eSIM
Model: Galaxy S21 Ultra 5G
Brand: Samsung
Carrier compatibility: Unlocked
Storage: 256 GB
Colour: Dark grey

Choose location

Suggested searches

Popular searches

Galaxy S21 Ultra 5GDark grey • 256 GB • Dual Physical SIM + eSIM

Galaxy S21 Ultra 5GDark grey • 256 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.

Hakim A.

Deivids S.

Richard M.

Andrea N.

Keith H.

Michelle G.

Popular searches

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

Durability

Overall performance

Camera

Screen quality

Related articles

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

Buying your teen's first phone? Here’s how to keep them safe | Back Market

Best Galaxy smartphones: From deluxe to budget | Back Market

Some proof that refurbished electronics reduce the negative impact of tech on the planet | Back Market

Is the Samsung S9 still a good phone to buy? | Back Market

Samsung S20 comparison: Samsung S20 FE, S20, S20+ or S20 Ultra 5G? | Back Market

New vs. Refurbished: The Environmental Impact of the Tech Industry | Back Market

Welcome to Back Market