
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 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 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 26/04/2026, United Kingdom.
ok with the phone ecstatic but not with the battery strength. it goes down too quick.
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Galaxy S21 Ultra 5G 128GB - Black - Unlocked
Condition
Excellent
Purchased
14/04/2026
Reviewed 03/11/2026, United Kingdom.
phone arrived promptly and was as described on the website. Phone has absolutely nothing wrong with the screen or the body. Battery lasts a long time between charges. Very happy with this purchase. 🙂
Galaxy S21 Ultra 5G 256GB - Silver - Unlocked
Galaxy S21 Ultra 5G 256GB - Silver - Unlocked
Condition
Premium
Purchased
22/10/2026
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
Purchased
19/05/2026
Dynamic AMOLED 2XScreen type
1440 x 3200Resolution
USB-CConnector
Phantom titaniumColour (official name)
40 megapixelsFront camera
108 megapixelsMain camera
NoFoldable
2021Year of Release
5GMobile network
The Samsung Galaxy S21 Ultra 5G is a flagship smartphone that offers an impressive combination of advanced features and powerful performance. Released in January 2021, this model remains a top choice for users seeking high-end specifications and versatile functionality.
Key features:The Samsung Galaxy S21 Ultra 5G is perfect for professionals, content creators, and tech enthusiasts who require a powerful device for multitasking, photography, and media consumption. Its expansive display and advanced camera capabilities make it ideal for users who prioritize high-quality visuals and performance.
Pros & Cons:| Pros | Cons |
|---|---|
| Exceptional camera performance with 108MP sensor. | Large size may not suit all users. |
| Stunning AMOLED display with vibrant colours. | High price point compared to other models. |
Choosing a refurbished Samsung Galaxy S21 Ultra 5G allows you to enjoy premium features while being environmentally conscious. Back Market ensures each device undergoes rigorous testing and quality checks, providing you with a reliable product. Learn more about our quality standards.




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