Galaxy S21 Ultra 5G • Locked T-MobileSilver • 128 GB • Physical SIM + eSIM

(74 reviews)

$295.21

Save $1,204.79

Free delivery by Jun 16 - 17

Express delivery by Jun 15 - 16 from $15.00

Restored professionally

Based on up to 100 points of inspection

Customer reviews for Galaxy S21 Ultra 5G • Locked T-Mobile

Overall rating

74 verified reviews

Rating details

Battery
4.2/5
Shipping
4.3/5
Lens & Camera
4.4/5
Accessories
3.9/5
Packaging
4.3/5
Overall performance
4.3/5
Appearance
4.2/5

Reviews

Lani B.
Verified purchase
Reviewed 5/11/25, United States.
The phone is in great condition. ONE tiny nick in a discreet spot, can't even notice! No scratches on screen or back . Definitely worth the money I spent. Phone works exactly how it suppose to. Another plus was fast shipping. I couldn't be happier.
Galaxy S21 Ultra 5G 256GB - Silver - Locked T-Mobile
Galaxy S21 Ultra 5G 256GB - Silver - Locked T-Mobile
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
4/28/25
Scott H.
Verified purchase
Reviewed 8/17/23, United States.
I'm really happy with the phone, but the Asurian insurance plan is terrible. The screen on my phone cracked within 10 days so I filed a claim with Asurian. I entered all of the info into their system. They acknowledged my claim and asked me to fill in a pdf with all of the same info unless I already provided it. Apparently, they wanted me to provide it again and I only learned that after spending 45 minutes on the phone. They also asked for a copy of the product receipt and insurance receipt. They should have all of this on file. The latest request is for a picture of the front and back of the phone. I wonder what the next hoop is that they want me to jump through. It feels like they are making this difficult on purpose to prevent claims. Also, Back Market is not listed as a retailer with Asurian so it's impossible to get info from them on claim status.
Galaxy S21 Ultra 5G 256GB - Black - Locked T-Mobile
Galaxy S21 Ultra 5G 256GB - Black - Locked T-Mobile
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
7/31/23
Tanya B.
Verified purchase
Reviewed 5/12/25, United States.
Phone said it was in good shape, I would say excellent
Galaxy S21 Ultra 5G 256GB - Silver - Locked T-Mobile
Galaxy S21 Ultra 5G 256GB - Silver - Locked T-Mobile
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
4/29/25
Kevin P.
Verified purchase
Reviewed 11/10/24, United States.
Very quick shipping. Product came as described.
Galaxy S21 Ultra 5G 256GB - Black - Locked T-Mobile
Galaxy S21 Ultra 5G 256GB - Black - Locked T-Mobile
Condition
Premium
Close to perfection. The body may have tiny micro-scratches. For items with screens, the screen will be flawless.
Purchased
10/28/24
Nicolo C.
Verified purchase
Reviewed 10/29/23, United States.
I purchased a phone advertised as excellent condition and it wasn't!! the top of the screen has a chip and right below it a scratch!!! The bottom of the phone buy speaker and charging port are chipped and scratched...I had no choice but to keep the phone because my previous phone was no longer working...I wasn't going to leave a review but I think you should know that it wasn't in excellent condition but phone is in good working condition everything works as it should...Thanks Nick
Galaxy S21 Ultra 5G 128GB - Black - Locked T-Mobile
Galaxy S21 Ultra 5G 128GB - Black - Locked T-Mobile
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
10/15/23
Armando R.
Verified purchase
Reviewed 9/25/23, United States.
Phone is in terrible shape considering this is considered "good." It has several scratches on the screen. Some are so deep I can feel them with my fingernail. USB-C port looks to be in bad shape too. Didn't even try turning it on. Very disappointed.
Galaxy S21 Ultra 5G 128GB - Black - Locked T-Mobile
Galaxy S21 Ultra 5G 128GB - Black - Locked T-Mobile
Condition
Good
Light signs of wear. The body may have light micro-scratches. For items with screens, the screen will have no scratches.
Purchased
9/21/23
Gary C.
Verified purchase
Reviewed 9/3/23, United States.
In better than new condition
Galaxy S21 Ultra 5G 128GB - Black - Locked T-Mobile
Galaxy S21 Ultra 5G 128GB - Black - Locked T-Mobile
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
8/22/23

Everything you ever wanted to know about the Galaxy S21 Ultra 5G • Locked T-Mobile

Durability
Overall performance
Camera
Screen quality

USB-CConnector
Phantom SilverColor (official name)
Galaxy S21 Ultra 5GModel
SM-G998UManufacturer Ref.
12 GBMemory (GB)
2021Release Year
128 GBStorage
8 ozWeight
0.77SAR head

The Samsung Galaxy S21 Ultra 5G, released in January 2021, remains a powerful flagship smartphone with a large, vibrant display and versatile camera system. Though it is a couple of generations old, it continues to meet the needs of users who require high performance and advanced features in a premium device.

Key features:

Release Date: January 2021
Display: 6.8-inch Dynamic AMOLED 2X, QHD+ resolution, 120Hz refresh rate
Processor: Exynos 2100 (global) / Snapdragon 888 (USA)
Camera: Quad rear cameras including 108MP wide, 12MP ultra-wide, and dual 10MP telephoto lenses with 100x Space Zoom
Operating System: Ships with Android 11 and Samsung One UI
Connectivity: 5G compatible for fast network speeds

Who is this for?

The Galaxy S21 Ultra 5G is suited for professionals, content creators, and tech enthusiasts who want a large, high-resolution display and advanced camera capabilities. It is ideal for users who need a robust device for multitasking, photography, and media consumption. Those seeking a more compact or budget-friendly model might consider newer or smaller Galaxy models.

Pros & Cons: Pros Cons Large, vibrant 6.8-inch AMOLED display with smooth 120Hz refresh rate. Heavier and bulkier compared to smaller Galaxy models. Versatile quad-camera system with high-resolution and zoom capabilities. Ships with Android 11, which may require updates for latest features. 5G connectivity for future-proof network speeds. No expandable storage option.
Why refurbished?

Choosing a refurbished Samsung Galaxy S21 Ultra 5G supports a more sustainable approach by extending the life of premium devices. Each pre-owned phone is carefully tested and restored to meet Back Market’s quality standards. Learn more about our quality standards.

Connector: USB-C
Color (official name): Phantom Silver
Model: Galaxy S21 Ultra 5G
Manufacturer Ref.: SM-G998U
Memory (GB): 12 GB
Release Year: 2021
Storage: 128 GB
Weight: 8 oz
SAR head: 0.77
Screen size (inches): 6.8
Network: 5G
SAR body: 1.02
Brand: Samsung
Screen type: Dynamic AMOLED 2X
Last OS Compatibility: Yes
Resolution: 1440 x 3200
OS: Android
Color: Silver
SIM card: Physical SIM + eSIM
Carrier compatibility: T-Mobile
Serie: Samsung Galaxy S
Foldable: No
Front camera: 40 megapixels
Main camera: 108 megapixels
Memory Card Slot: No

Choose location

Suggested searches

Popular searches

Galaxy S21 Ultra 5G • Locked T-MobileSilver • 128 GB • Physical SIM + eSIM

Galaxy S21 Ultra 5G • Locked T-MobileSilver • 128 GB • Physical SIM + eSIM

Restored professionally

Comes with

Often bought together

Customer reviews for Galaxy S21 Ultra 5G • Locked T-Mobile

Overall rating

Rating details

Reviews

Reviews

Lani B.

Scott H.

Tanya B.

Kevin P.

Nicolo C.

Armando R.

Gary C.

Popular searches

Everything you ever wanted to know about the Galaxy S21 Ultra 5G • Locked T-Mobile

Durability

Overall performance

Camera

Screen quality

Related articles

Android Phone Activation Guide | eSIM or SIM | Back Market

How to factory reset an Android phone (4 quick scenarios) | Back Market

iPhone vs. Android: Which OS is Right for You? | Back Market

Can you use a Galaxy watch with an iPhone? | Back Market

Best smartwatch for Android: The only guide you need | Back Market

Why now is the right time to upgrade to a PS5 | Back Market

The wired headphones revival – why celebs are plugging back in | Back Market

Welcome to Back Market