Terms apply
Proudly refurbished by TheGeex
Comes with
Compatible charging cable
249 verified reviews in the last 12 months.
Carmen J.
Purchased on January 29, 2025
Verified purchaseThis was my first time buying a refurbished phone & the first time I've ever spent so much money online & in general at once. I was nervous about it after realizing it was being delivered thru FedEx. UGH!!! I'm happy to say that my phone is PERFECTLY FLAWLESS (lol)! I ABSOLUTELY LOVE my Galaxy S23 Ultra got the lavender color i wanted with the 512 GB. I didn't know that the color of it would make a price difference, ya learn something new everyday lol. I'm referring BM to everyone i know. I've been saving my coins for a couple years & FINALLY cashed them in so I could purchase this phone. I could've gotten the Galaxy S24 Ultra but that would've left me broke & I didn't wanna be broke lol. Besides I needed to buy screen protector and a case so that's exactly what I did. BM ya'll are the BEST & thank you for existing I'm a customer for life.
Reviewed in the United States on February 5, 2025
Kenzie M.
Purchased on February 28, 2025
Verified purchaseI ordered excellent condition, just a few scratches on the edge of the build, but it's covered by the case.Perfect screen no scratches. Great refurbishing job, system works perfectly after having this for 2 weeks.
Reviewed in the United States on March 17, 2025
Anita O.
Purchased on February 3, 2025
Verified purchaseGreat experience with Back Market. Got a refurbished Galaxy 23 ultra and it was perfect. Couldn't face spending so much money on a brand new phone, so this fit the bill. Great price, fast shipping, and great communication. Bonus was the discount code for signing up with Visible. Saving a ton of money compared to Verizon. Will definitely use them again!!
Reviewed in the United States on February 16, 2025
Jon Z.
Purchased on October 15, 2024
Verified purchaseVery happy with my s23 ultra refurbished purchase in excellent condition. No blemishes or scratches (large or micro) on the screen or body. Swapping my physical SIM card was smooth and the phone was up and working like normal within an hour of getting it. Quick delivery; very satisfied, will absolutely buy from Back market and this supplier again
Reviewed in the United States on December 9, 2024
Deborah C.
Purchased on February 9, 2025
Verified purchaseLove my new Galaxy S23 Ultra! Looks brand new and the setup was super easy. This is my second purchase from Back Market and I will not go anywhere else, quality product, communication is excellent and so easy to trade in old phone!
Reviewed in the United States on February 24, 2025
Ricky B.
Purchased on July 25, 2024
Verified purchaseThis is my second device Ive bought and I gotta say they did it again this is the best condition and the best seller I mean refurbished is way better I’m just gonna put out there for yall who doesn’t trust this type of store or service but I’ll tell you one thing back market has evolve their workers might be perfect or not perfect but in the end of the day we’re just human working to be better, and I’m glad I have the things to say thank you back market.
Reviewed in the United States on December 9, 2024
T V.
Purchased on June 30, 2024
Verified purchaseWorks as advertised. Screen is flawless and the camera works well. Got this as a gift, and the receiver was delighted. Clearly professionally refurbished and well packaged. Would recommend this seller.
Reviewed in the United States on December 9, 2024
Here’s what you help prevent on average by choosing a reborn smartphone over a brand new one.
That's like driving an SUV from NYC to Chicago.
That’s around the weight of a baseball.
That's like 20 dogs digging in your yard for a week.
That's like running a faucet for 3 days
SM-S918UZGFXAAManufacturing part numbers (MPN)
GreenColor
6.8Screen size (inches)
Galaxy S23 UltraModel
AndroidOS
1440 x 3088Resolution
UnlockedCarrier compatibility
512 GBStorage
12 GBMemory
Ready to own the night? Whether you’re headed to a concert or romantic night out, there’s no such thing as bad lighting with Night Mode. Galaxy S23 Ultra lets you capture epic content in any setting with stunning Nightography.
Create crystal-clear content worth sharing with Galaxy S23 Ultra 200MP camera. Whether you’re posting or printing, Galaxy S23 Ultra always does the moment justice.
Capture incredibly smooth video during life’s most exciting moments. With Video Stabilization, you can easily record daytime outdoor adventures or those spur-of-the-moment dance parties at night.
Capture scribbles, strokes of genius and everything in between with the built-in S Pen. Writing your next short story or sketching on the go has never felt this easy.
Capture epic selfies and beautiful photos with the click of your S Pen. Simply open up the camera app and click the button on the S Pen instead of the screen. Getting that great shot just got easier.
Whether you’re working hard, playing hard or doing both at the same time, smoothly switch between apps with our fastest processor ever.
Power through a packed day or a long night of gaming without worrying about your phone dying. The robust 5,000mAh battery has been fine-tuned with a smarter processor that helps manage energy usage without slowing you down.¹
You’re good on storage space. With an impressive amount of storage, starting at 256GB, you can enjoy being behind the camera without the stress that comes with getting close to filling up your phone.
Watch your content comfortably as Adaptive Vision Booster helps your screen adapt to your environment. Whether out in direct sunlight or in bed with the lights off, the contrast on Galaxy S23 Ultra expansive screen still looks amazing.
Easily answer video calls and collaborate with the team while remote with Galaxy S23 Ultra and Google Meet.²
Send even your large files —whether it’s cute puppy videos or work documents —between your Galaxy S23 Ultra and any iOS or Android device. Quick Share helps minimize frustration when sharing the epic.³
Get the group together for one shot and capture a variety of candid moments. Simply tap, record and choose from multiple stills and videos.⁴
Capture memories in stunning detail with 8K Video recording. No matter the moment, Galaxy S23 Ultra lets you shoot ultra-bright, crystal-clear scenes —day or night.
Life’s best moments could happen at any second. With a battery that supports up to 45W Super-Fast Charging, it’s easy to stay ready. Power up your Galaxy S23 Ultra quickly and get back to making more memories.⁵
Take on the day confidently with a tough yet stylish phone —one built to resist spills and scratches.
Design your own Galaxy experience with Galaxy S23 Ultra. With our versatile One UI, you can personalize a lock screen that reflects your lifestyle.
Feel good knowing your new phone supports what you support. Galaxy S23 Ultra was designed to help you live in a more sustainable world, while enjoying everything that makes that life amazing.
Diving right into your new Galaxy S23 Ultra is easy. Simply transfer your favorite content —photos, calendar dates, alarms and even call history —from your previous phone with Smart Switch.
¹Based on average battery life under typical usage conditions. Average expected performance based on typical use. Actual battery life depends on factors such as network, features selected, frequency of calls, and voice, data, and other application usage patterns. Results may vary.
²Requires devices to have One UI 2.5 or later. Must be logged into the same Google account and Google Meet app must be activated on each device.
³For Galaxy-to-Galaxy or any other devices: Quick Share to Galaxy smartphones and tablets smartphones and tablets with Android OS version 10.0 (Q) and One UI 2.1 or above requires Wi-Fi and Bluetooth connection.
³Quick Share to iOS and Android devices available by sending shared link: individual files shared cannot exceed 3GB (for a total of 5GB per day) and link will expire after two days; requires a Samsung account and Internet connection.
³For Galaxy-to-Galaxy device: Quick Share between Galaxy smartphones and tablets with Android OS version 10.0 (Q) and One UI 2.1 or above requires Wi-Fi and Bluetooth connection.
⁴Single Take captures images and video for up to 15 seconds.
⁵Wall charger sold separately; use only Samsung-approved chargers and cables. To avoid injury or damage to your device, do not use incompatible, worn or damaged batteries, chargers or cables. Supports up to 45W charging.
Manufacturing part numbers (MPN) | SM-S918UZGFXAA |
Color | Green |
Screen size (inches) | 6.8 |
Model | Galaxy S23 Ultra |
OS | Android |
Resolution | 1440 x 3088 |
Carrier compatibility | Unlocked |
Storage | 512 GB |
Memory | 12 GB |
Screen type | Dynamic AMOLED 2X |
Network | 5G |
Manufacturer Ref. | SM-S918UZGFXAA |
Memory Card Slot | No |
Verizon compatible | Yes |
AT&T compatible | Yes |
T-Mobile compatible | Yes |
Release Year | 2023 |
Last OS Compatibility | Yes |
Foldable | No |
Front camera | 12 megapixels |
SAR head | 1.18 |
Series | Samsung Galaxy S |
SIM card | Physical SIM + eSIM |
Retro tech | No |
Main camera | 200 megapixels |
Color (official name) | Green |
matching_key | Galaxy S23 Ultra Green 512 12 Physical SIM + eSIM Unlocked |
Company name | Samsung Electronics |
Company email address | support@samsung.com |
Company postal address | Samsung House, 1000 Hillswood Drive, Chertsey, Surrey, KT16 0PS, UK |
Brand | Samsung |
Weight | 8 oz |
Height | 6.4 in |
Width | 3.1 in |
Depth | 0.4 in |
Welcome to Back Market
The best prices for high-quality reborn tech by sellers we’ve checked and vetted. We don’t mind if you Google us.