Galaxy S23 Ultra • UnlockedRed • 512 GB • Physical SIM + eSIM

(1,029 reviews)

$449.99

Save $930.00

Deals available

See limited deals and price drops

Free delivery by Jun 5 - 6

Restored professionally

Based on up to 100 points of inspection

Customer reviews for Galaxy S23 Ultra • Unlocked

Overall rating

1,029 verified reviews

Rating details

Accessories
4.1/5
Appearance
4.3/5
Battery
4.3/5
Lens & Camera
4.5/5
Overall performance
4.3/5
Packaging
4.4/5
Shipping
4.5/5

Reviews

Noah G.
Verified purchase
Reviewed 1/4/26, United States.
This is the first phone I've purchased for myself, and I have to say it does not dissappoint. It is a major upgrade from a Samsung Galaxy s8 and checks all the boxes in what I wanted in a new phone. Great camera quality, more storage, responsive and larger screen. Best part was I didn't have to spend over 1k to own it. 10/10 would purchase from Back Market again.
Galaxy S23 Ultra 512GB - Green - Unlocked
Galaxy S23 Ultra 512GB - Green - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
12/21/25
Francisco M.
Verified purchase
Reviewed 5/17/26, United States.
My S23 ultra came to Venezuela two days ago, honestly it didn't came in fair state..... think it's really in amazing state, almost brand new one, just a few scratchs, but everything work totally perfect. The package also came with a data cable usb-C and a pretty silicon case with the logo of the lab (Cellfee). I wasn't expecting get it with the Spen, but there was, inside of the Phone and totally functional. And also the Phone came with a screen protector. I highly recommend the seller, was the first device that i buy here in Backmarket, and Cellfee make it perfect.
Galaxy S23 Ultra 256GB - Black - Unlocked
Galaxy S23 Ultra 256GB - Black - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
5/3/26
William L.
Verified purchase
Reviewed 1/12/26, United States.
received it in 2 days and let me tell you. it looked and operates like a brand new one above and beyond what I thought it would be highly recommend the picture of the moon was taken with this phone
Galaxy S23 Ultra 256GB - Green - Unlocked
Galaxy S23 Ultra 256GB - Green - 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
12/29/25
Carol R.
Verified purchase
Reviewed 1/11/26, United States.
This is my second time to get a phone from Back Market. Initially I got a Galaxy Note 10. Yes if was old, I used it over 10 years. It was a great phone. Just like new. This time I got a Galaxy S23 Ultra. Again, just like new. No problem connecting to network or transferring data from my ancient phone! I love the phone; yet I am so far behind on the technological leap from a 10 to a 23! I highly recommend purchasing a phone from Back Market. It is much less expensive than buying new and it helps the planet to recycle this tech. I've never had an issue to resolve with Back Market. Things have always been as Back Market said they would be. I tried to get a refurbished phone from AT&T. If was clear that they had not checked all the points that they claimed to check. Back Market does the job right!
Galaxy S23 Ultra 256GB - Black - Unlocked
Galaxy S23 Ultra 256GB - 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
12/15/25
Eric O.
Verified purchase
Reviewed 11/20/25, United States.
I just received my Galaxy s23 ultra today (fair condition), and all I can say is that I'm amazed with the quality! I don't have much money to spend , so I was kind of hesitant to buy refurbished, but back market definitely changed my mind! I will always continue to support this amazing company, and it's sellers .
Galaxy S23 Ultra 512GB - Green - Unlocked
Galaxy S23 Ultra 512GB - Green - Unlocked
Condition
Fair
Signs of wear. The body may have a few visible scratches and dents. Items with screens may have light scratches.
Purchased
11/17/25
Rose R.
Verified purchase
Reviewed 5/27/26, United States.
So far, it's been great. The phone looked flawless and it was very well packaged, it really does look brand new. It runs smooth and I have not seen any problems as of today.
Galaxy S23 Ultra 256GB - Black - Unlocked
Galaxy S23 Ultra 256GB - 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
5/11/26
Rigoberto L.
Verified purchase
Reviewed 5/3/26, United States.
I am very happy with my Samsung Galaxy S23 Ultra. At first, I had a minor issue installing the SIM card, but after a few seconds, my phone accepted it without any problems, and the device works perfectly. Thank you very much for the product.
Galaxy S23 Ultra 256GB - Green - Unlocked
Galaxy S23 Ultra 256GB - Green - 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
4/19/26

Everything you ever wanted to know about the Galaxy S23 Ultra • Unlocked

Durability
Overall performance
Camera
Screen quality

SM-S918UZGFXAAMPN
Samsung Galaxy SSerie
Physical SIM + eSIMSIM card
Galaxy S23 UltraModel
6.4 inHeight
2023Release Year
1440 x 3088Resolution
512 GBStorage
UnlockedCarrier compatibility

The Samsung Galaxy S23 Ultra sits at the top of Samsung’s smartphone lineup, bringing pro-level tools to everyday users. Released in February 2023, it’s only one generation old as of 2025, which means most of its hardware is still very much in the “cutting edge” club. Key highlights include its large display, distinctively integrated S Pen, and a camera system that raises the bar for mobile zoom and detail.

Key features:

Release Date: February 2023
Display: 6.8-inch QHD+ Dynamic AMOLED 2X, 120Hz refresh rate
Processor: Qualcomm Snapdragon 8 Gen 2 for Galaxy
Camera: Quad rear cameras: 200MP wide, 12MP ultra-wide, 10MP 3x telephoto, 10MP 10x periscope telephoto
Stylus: Integrated S Pen for note-taking, sketching, and remote control
Build: Armor Aluminum frame, Gorilla Glass Victus 2 front and back
Connectivity: 5G and Wi-Fi 6E compatible
Operating System: Ships with Android 13 (One UI 5.1)

Who is this for?

The Galaxy S23 Ultra is made for multitaskers, productivity pros, and anyone who needs a big screen for creative work or detailed viewing. If you’ve outgrown “good enough” smartphone cameras, the S23 Ultra’s quartet of lenses, especially that 200MP main sensor, lets you get closer or see more without a lot of extra gear. Compared to the S24 Ultra, you’re not missing much in terms of day-to-day use, but you’ll save yourself the shiny-new-tax – and the S23 Ultra still outclasses most other Android phones on the market. If you just want a basic, pocketable phone, this probably isn’t your match.

Pros & Cons: Pros Cons High-resolution 200MP camera for detailed photos. Large and heavy—not for small hands or tight pockets. Integrated S Pen for precise input and productivity features. Pricey repairs if dropped—gargantuan screens tend to crack rather than bounce. Smooth 120Hz display makes gaming and scrolling feel fluid. No microSD slot—cloud storage fans won’t mind, but file hoarders might. Top-tier performance from its Snapdragon 8 Gen 2 chip. Overkill for casual users—if you just check email, the Ultra is probably Ultra-unnecessary.
Why refurbished?

Choosing a refurbished Samsung Galaxy S23 Ultra means less e-waste and one less device destined for the landfill. At Back Market, every pre-owned device goes through rigorous testing to ensure it’s up to our standards—no shortcuts. If you want to see what that means, read about our quality standards here. Less waste, same big screen energy.

MPN: SM-S918UZGFXAA
Serie: Samsung Galaxy S
SIM card: Physical SIM + eSIM
Model: Galaxy S23 Ultra
Height: 6.4 in
Release Year: 2023
Resolution: 1440 x 3088
Storage: 512 GB
Carrier compatibility: Unlocked
Memory (GB): 12 GB
Manufacturer Ref.: SM-S918U
Color: Red
Memory Card Slot: No
Main camera: 200 megapixels
SAR head: 1.12
Last OS Compatibility: Yes
Network: 5G
Foldable: No
Color (official name): Red
Front camera: 12 megapixels
Depth: 0.4 in
Brand: Samsung
Weight: 8 oz
Width: 3.1 in
SAR body: 0.92
Screen type: Dynamic AMOLED 2X
OS: Android
Screen size (inches): 6.8

Choose location

Suggested searches

Popular searches

Galaxy S23 Ultra • UnlockedRed • 512 GB • Physical SIM + eSIM

Galaxy S23 Ultra • UnlockedRed • 512 GB • Physical SIM + eSIM

Restored professionally

Comes with

Often bought together

Customer reviews for Galaxy S23 Ultra • Unlocked

Overall rating

Rating details

Reviews

Reviews

Noah G.

Francisco M.

William L.

Carol R.

Eric O.

Rose R.

Rigoberto L.

Popular searches

Everything you ever wanted to know about the Galaxy S23 Ultra • Unlocked

Durability

Overall performance

Camera

Screen quality

Related articles

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

Android Phone Activation Guide | eSIM or SIM | Back Market

Apple Watch Series 11 colors guide: find the perfect match for your personal style | Back Market

iPad vs Samsung Tablet Comparison | Back Market

Welcome to Back Market