Items
All guaranteed 100% functional
Compatible charging cable
Refurbished price:£206.00
£999.00 newVersus £999.00 new
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
Reviewed 22/09/2026, United Kingdom.
Device was in great condition, but it was somehow unlockable, due to being linked to a US service provider (all according to AI). So, I was unable to access mobile data - phone only worked when linked to WIFI.
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Condition
Excellent
Purchased
13/09/2026
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
Purchased
23/03/2025
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
Purchased
19/08/2026
Reviewed 22/08/2025, United Kingdom.
I’m really happy with my purchase – absolutely worth it! The condition was even better than described on the website. The only small thing I’ve noticed is that the screen response feels slightly slower compared to my old S21 Ultra in similar condition, but overall I’m very satisfied. It's a silver one just I coverd the camera wiht a black case! Definitely recommend Back Market :)
Galaxy S21 Ultra 5G 128GB - Silver - Unlocked
Galaxy S21 Ultra 5G 128GB - Silver - Unlocked
Condition
Good
Purchased
04/08/2025
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
Purchased
06/07/2026
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
Purchased
25/04/2026
Reviewed 02/06/2025, United Kingdom.
was the first time coming across this online store, I was very sceptical as the prices were very low so I carefully read every review and edited to purchase the s21 ultra. It arrived less then 48 hours later with clear communication on tracking and delivery, opened the box and the phone was in prestige condition basically brand new will never be using a highstreet store for phones etc again this is definitely the new go to. I oped for the fair condition the cheapest one so didn't expect the service and item I received. thankyou back market
Galaxy S21 Ultra 5G 256GB - Black - Unlocked
Galaxy S21 Ultra 5G 256GB - Black - Unlocked
Condition
Fair
Purchased
19/05/2025
UnlockedCarrier compatibility
227 gWeight
12 GBMemory (GB)
5GMobile network
NoSD Card Slot
SM-G998BManufacturer Ref
NoFoldable
YesCompatible with latest Update
SamsungBrand
The Galaxy S21 Ultra 5G is a high-end smartphone that combines cutting-edge technology with a premium design. Launched in January 2021, it remains a top choice for those seeking exceptional performance and versatile camera capabilities.
Key features:The Galaxy S21 Ultra 5G is ideal for professionals, photographers, and tech enthusiasts who require a powerful device for multitasking and high-quality photography. It’s also a great option for users who enjoy media consumption on a large, vibrant display.
Pros & Cons:| Pros | Cons |
|---|---|
| Exceptional camera quality with versatile shooting options. | Large size may not be suitable for all users. |
| Stunning display with vibrant colours and high refresh rate. | Premium build can be prone to fingerprints. |
Choosing a refurbished Galaxy S21 Ultra 5G allows you to access top-tier features while making an eco-conscious choice. Each device is rigorously tested to meet Back Market’s quality standards, ensuring reliability. Learn more about our quality standards.
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