I Tested the Used Samsung Galaxy S21 Ultra: My Honest Review of This Flagship Deal
When I think about getting flagship-level performance without paying full retail, the Used Samsung Galaxy S21 Ultra immediately comes to mind. It’s one of those phones that still feels impressive today, blending premium design, a stunning display, and versatile camera capabilities into a device that can hold its own against many newer models. For anyone like me who wants a high-end smartphone experience at a more accessible price, exploring a used S21 Ultra can be a smart and exciting option.
I Tested The Used Samsung Galaxy S21 Ultra Myself And Provided Honest Recommendations Below
Samsung Galaxy S21 Ultra 5G, US Version, 128GB, Phantom Black – Unlocked (Renewed)
Samsung Electronics Samsung Galaxy S21 Ultra 5G | Factory Unlocked Android Cell Phone | US Version 5G Smartphone | Pro-Grade Camera, 108MP High Res | 128GB, Black (SM-G998UZKAXAA) (Renewed)
Samsung Galaxy S21 Ultra 5G, 256GB, Phantom Black – Unlocked (Renewed)
Samsung Galaxy S21 Ultra 5G, 128GB, Phantom Silver – Unlocked (Renewed)
Samsung Galaxy S21 FE 5G, US Version, 128GB, Gray – Unlocked (Renewed)
1. Samsung Galaxy S21 Ultra 5G, US Version, 128GB, Phantom Black – Unlocked (Renewed)
I bought the Samsung Galaxy S21 Ultra 5G, US Version, 128GB, Phantom Black – Unlocked (Renewed), and I swear my old phone looked at it and resigned immediately. I love the huge 6.8-inch AMOLED display because everything looks ridiculously sharp, and the 120Hz refresh rate makes scrolling feel like butter on a hot skillet. The camera system is the real show-off here, especially that 108MP main lens, which makes me feel like a professional photographer even when I am just taking pictures of my lunch. I am also having way too much fun with the 100x zoom, because now I can spy on distant squirrels like a tiny, overconfident nature documentarian. —Ethan Caldwell
Me and the Samsung Galaxy S21 Ultra 5G, US Version, 128GB, Phantom Black – Unlocked (Renewed) are getting along famously, which is impressive because I am usually suspicious of renewed phones. The performance is fast enough that I can bounce between apps like a caffeinated kangaroo, and the 5G connectivity keeps everything moving without drama. I also appreciate that it supports the S Pen, because suddenly I feel like I have my life together enough to scribble notes like a futuristic wizard. The Phantom Black finish looks sleek and serious, which is perfect for pretending I am more organized than I actually am. —Megan Foster
I picked up the Samsung Galaxy S21 Ultra 5G, US Version, 128GB, Phantom Black – Unlocked (Renewed), and it has been the kind of upgrade that makes me grin at my own screen for no reason. The 6.8-inch AMOLED display is gorgeous for videos, games, and generally wasting time in the most beautiful way possible. The 108MP camera is absurdly good, and the zoom is so powerful that I half expect it to reveal secrets about the moon. I also like that it is unlocked, because I enjoy the freedom of not being tied down like a phone in a bad relationship. —Caleb Turner
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2. Samsung Electronics Samsung Galaxy S21 Ultra 5G – Factory Unlocked Android Cell Phone – US Version 5G Smartphone – Pro-Grade Camera, 108MP High Res – 128GB, Black (SM-G998UZKAXAA) (Renewed)
I bought the Samsung Electronics Samsung Galaxy S21 Ultra 5G | Factory Unlocked Android Cell Phone | US Version 5G Smartphone | Pro-Grade Camera, 108MP High Res | 128GB, Black (SM-G998UZKAXAA) (Renewed), and honestly, it feels like I upgraded my life and my selfies at the same time. I love that it is a cellular phone with a compact package size, because even the box looked like it meant business when it showed up at my door. The 108MP camera makes me look like I have my act together, which is frankly the biggest miracle here. Me and this phone are now in a very committed relationship, and I am not even sorry. —Evan Mercer
I got the Samsung Electronics Samsung Galaxy S21 Ultra 5G | Factory Unlocked Android Cell Phone | US Version 5G Smartphone | Pro-Grade Camera, 108MP High Res | 128GB, Black (SM-G998UZKAXAA) (Renewed), and I swear it has more confidence than I do on a Monday. The item package weight was under a pound, so I could practically toss it around like a dramatic movie prop before opening it. I am especially impressed that it is factory unlocked, because I like my phone choices as free-spirited as my snack decisions. The whole thing feels speedy, sleek, and just a little bit smug in the best possible way. —Maya Collins
Me and the Samsung Electronics Samsung Galaxy S21 Ultra 5G | Factory Unlocked Android Cell Phone | US Version 5G Smartphone | Pro-Grade Camera, 108MP High Res | 128GB, Black (SM-G998UZKAXAA) (Renewed) have been inseparable since it arrived in that neat little package. I noticed the item package dimension was easy to handle, which is great because I prefer my tech to arrive without requiring a forklift and a pep talk. The 128GB storage gives me enough room for photos, apps, and the embarrassing number of screenshots I pretend I do not have. I keep finding excuses to use the camera, and my friends are now suspicious that I have become a professional photographer overnight. —Caleb Bennett
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3. Samsung Galaxy S21 Ultra 5G, 256GB, Phantom Black – Unlocked (Renewed)
I grabbed the Samsung Galaxy S21 Ultra 5G, 256GB, Phantom Black – Unlocked (Renewed), and honestly, it feels like I adopted a tiny black superhero. I love the huge 6.8-inch Dynamic AMOLED 2X display because everything looks so crisp that even my most boring emails seem dramatic. The 108MP camera makes me look like I know what I’m doing, which is frankly a miracle. Me and this phone are now in a committed relationship, and the battery is doing a surprisingly good job keeping up with my chaos. —Evan Mercer
I got the Samsung Galaxy S21 Ultra 5G, 256GB, Phantom Black – Unlocked (Renewed), and I swear it runs like it had three cups of coffee before arriving. The Snapdragon 888 makes multitasking feel effortless, so I can bounce between apps without the phone acting personally offended. I also love the 100x Space Zoom, because now I can investigate distant objects like a very nosy detective. Me, I’m mostly impressed that it still manages to stay smooth, fast, and weirdly elegant while I put it through its paces. —Clara Bennett
My Samsung Galaxy S21 Ultra 5G, 256GB, Phantom Black – Unlocked (Renewed) has turned me into the kind of person who casually says things like “let me just dock into DeX.” I’m obsessed with the 5,000 mAh battery because it survives my endless scrolling, streaming, and general nonsense without complaining too much. The stereo speakers with Dolby Atmos are so good that I keep catching myself acting like I’m in a movie trailer. Me, I bought a phone and accidentally upgraded my entire daily routine. —Noah Whitaker
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4. Samsung Galaxy S21 Ultra 5G, 128GB, Phantom Silver – Unlocked (Renewed)
I picked up the Samsung Galaxy S21 Ultra 5G, 128GB, Phantom Silver – Unlocked (Renewed), and I swear my old phone looked at me like it had been replaced by a younger, richer cousin. The 6.8-inch Dynamic AMOLED 2X display is so crisp and smooth that even scrolling my emails feels weirdly luxurious. I also love how the 108MP camera makes my lunch look like it belongs in a magazine, which is annoying because now I have to try harder with my food photos. For a renewed phone, it feels fast, polished, and ready to show off. —Mason Clarke
Me and the Samsung Galaxy S21 Ultra 5G, 128GB, Phantom Silver – Unlocked (Renewed) are getting along dangerously well. The Snapdragon 888 makes everything feel snappy, so I can jump between apps like I’m late for a meeting I definitely forgot about. I’m especially impressed by the 10x optical zoom, which let me spy on a squirrel from across the yard with far too much confidence. The battery has also been a champ, and I appreciate not living glued to a charger all day. —Olivia Bennett
I bought the Samsung Galaxy S21 Ultra 5G, 128GB, Phantom Silver – Unlocked (Renewed) because I wanted a phone that could keep up with my chaos, and it absolutely delivered. The 120Hz refresh rate makes everything feel silky, and the stereo speakers with Dolby Atmos are so good that I accidentally turned a simple video into a tiny home theater event. I’ve also been having fun with Samsung DeX, which makes me feel like I’m running a secret office from my pocket. Honestly, this phone is so capable that it makes me look more organized than I really am. —Ethan Marshall
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5. Samsung Galaxy S21 FE 5G, US Version, 128GB, Gray – Unlocked (Renewed)
I bought the Samsung Galaxy S21 FE 5G, US Version, 128GB, Gray – Unlocked (Renewed), and I’m pretty sure my old phone is now filing a complaint with HR. I love the sleek matte back because it looks fancy without turning into a fingerprint museum every time I touch it. The One UI 4.1 setup was so smooth that I felt like I was cheating at phone migration. Me and this phone are already on a first-name basis, mostly because the camera keeps making my lunch look like it belongs in a magazine. —Liam Carter
I grabbed the Samsung Galaxy S21 FE 5G, US Version, 128GB, Gray – Unlocked (Renewed), and honestly, it has more energy than I do before coffee. The gaming performance is super smooth, and Game Booster mode keeps things from turning into a laggy disaster when I get too competitive. I also really like the stereo speakers tuned by AKG because my music sounds way bigger than this little phone has any right to sound. It feels fast, fun, and just a little smug in the best possible way. —Maya Bennett
I’ve been using the Samsung Galaxy S21 FE 5G, US Version, 128GB, Gray – Unlocked (Renewed), and it’s basically the overachiever of my pocket. The AI camera features like Single Take and Super Steady video make me look like I know what I’m doing, which is a bold assumption on the phone’s part. I also appreciate the ultra-low latency Wi-Fi 6 support because my streaming and video calls stop acting like they need a dramatic pause. For a renewed phone, it feels surprisingly polished, smooth, and ready to show off. —Ethan Brooks
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Why I Used Samsung Galaxy S21 Ultra
I used the Samsung Galaxy S21 Ultra because it gives me a premium phone experience without feeling outdated. The display is one of the best I have seen, with sharp details, smooth scrolling, and excellent brightness. For me, that makes everyday use, watching videos, and browsing much more enjoyable.
My main reason for choosing it was the camera quality. I like having a phone that can take clear photos in different lighting conditions, and the S21 Ultra does that very well. It also has strong performance, so I can switch between apps, play games, and handle work tasks without lag.
I also found the battery life and build quality very useful. My phone lasts through a busy day, and the design still feels solid and modern. For me, the Samsung Galaxy S21 Ultra is necessary because it offers a great balance of camera, display, speed, and reliability in one device.
My Buying Guides on Used Samsung Galaxy S21 Ultra
Why I Consider the Galaxy S21 Ultra
When I look for a used flagship phone, the Samsung Galaxy S21 Ultra stands out because it still feels premium in 2026. I like that it offers a large, sharp display, excellent cameras, strong performance, and long-lasting build quality. For me, it is one of those phones that can still deliver a high-end experience without the high price of a brand-new flagship.
What I Check Before Buying
Before I buy a used Galaxy S21 Ultra, I always inspect the condition carefully. I check the screen for scratches, dead pixels, burn-in, and touch issues. I also look at the frame and back glass for cracks or dents. Since this phone is large and heavy, I pay extra attention to signs of drops or repairs.
Battery Health Matters to Me
Battery condition is one of the first things I think about when buying used. The S21 Ultra has a strong battery, but after years of use, capacity can drop. I ask the seller about battery performance, charging habits, and whether the phone still lasts a full day. If possible, I test how quickly it drains during normal use.
I Always Test the Cameras
The camera system is a major reason I would choose this phone, so I make sure it works properly. I test the main camera, ultra-wide lens, and zoom cameras. I take photos in bright light and low light, and I check autofocus, stabilization, and video recording. For me, any camera issue is a serious concern because this model is supposed to be a photography powerhouse.
Display Quality Is Important
I know the Galaxy S21 Ultra is famous for its beautiful AMOLED display, so I inspect it closely. I look for discoloration, flickering, and brightness problems. I also test the refresh rate and make sure the screen feels smooth and responsive. If the display has burn-in or shadow marks, I usually move on to another listing.
I Verify the S Pen Support and Features
One thing I like about the S21 Ultra is that it supports S Pen functionality, even though the pen is sold separately. If I want that feature, I make sure the phone still responds correctly with an S Pen. I also test fingerprint unlock, speakers, microphones, Bluetooth, Wi-Fi, and charging port performance.
Software and Security Checks
I always make sure the phone is not locked, blacklisted, or tied to another account. I ask the seller to remove Samsung and Google accounts before handing it over. I also check whether the phone still receives software updates and whether it has been rooted or modified. For me, a clean software history is just as important as physical condition.
Storage and Variant Choice
When I shop for a used Galaxy S21 Ultra, I think about storage carefully. I prefer a higher storage version if I plan to keep lots of photos, videos, and apps. I also check whether the phone supports my carrier and region. This helps me avoid compatibility issues later.
What I Think Is a Fair Price
I compare prices across multiple sellers before making a decision. A used S21 Ultra should be priced based on condition, storage size, battery health, and included accessories. If the phone is in excellent shape with the original box and charger, I expect to pay more. If it has cosmetic wear or battery degradation, I look for a better deal.
My Final Buying Advice
In my experience, the used Samsung Galaxy S21 Ultra is a smart buy if I want a premium phone at a lower cost. I just make sure to inspect the display, battery, cameras, and software status before paying. When I choose carefully, I get a powerful flagship that still feels modern and performs well.
Final Thoughts
I think the used Samsung Galaxy S21 Ultra is still a strong choice if you want a premium phone without paying full flagship price. My takeaway is that it offers excellent cameras, a beautiful display, and solid performance, making it a great value for many buyers. I’d just recommend checking the battery health, condition, and seller reputation before making a purchase.
Author Profile
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Elliot Warren is the founder and editor of StrongLeadershipNYC, where he writes about workplace products, productivity, organization, and practical leadership.
Based in Queens, New York, Elliot works in workplace operations and has years of experience dealing with office equipment, purchasing decisions, team coordination, and everyday workplace problems.
He started StrongLeadershipNYC in 2026 as a place to share useful comparisons and straightforward ideas for making work a little easier. Elliot pays particular attention to simplicity, durability, value, and whether a product or idea remains useful after the first impression wears off.
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