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Samsung

Samsung Galaxy S21 Ultra 5G, 128GB, Phantom Silver - Unlocked (Renewed)

  • Based on 1,016 reviews
Condition: Refurbished - Excellent
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Availability: Only 2 left in stock, order soon!
Fulfilled by Amazon
Arrives Thursday, Apr 30
Order within 14 hours and 11 minutes
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Features

  • The Galaxy S21 Ultra features a massive 6.8-inch Dynamic AMOLED 2X display with Quad HD+ resolution, HDR10+ support, and an adaptive 120Hz refresh rate that scales dynamically to deliver ultra-smooth visuals while conserving battery life.
  • Its rear camera system is a powerhouse, combining a 108MP wide sensor, 12MP ultra-wide lens, and two telephoto lenses (10MP each) with 3x and 10x optical zoom. With up to 100x Space Zoom, advanced AI scene optimization, and laser autofocus, the S21 Ultra captures extraordinary detail, whether shooting landscapes, zoomed-in subjects, or 8K video content.
  • The phone is powered by Snapdragon 888 (U.S.) or Exynos 2100 (global) paired with up to 16GB of RAM, making it exceptionally fast for gaming, multitasking, and demanding productivity apps. Coupled with Samsung DeX support, the Ultra can be used like a full desktop workstation for editing, presentations, and professional workflows.
  • The Galaxy S21 Ultra offers a 5,000 mAh intelligent adaptive battery with fast wired charging, fast wireless charging, and reverse wireless charging. Its AI-driven battery management optimizes power use based on your habits, allowing longer usage without frequent rechargingeven with heavy multitasking or 5G connectivity.
  • Security and connectivity are top-tier, featuring Samsung Knox Vault for advanced protection of sensitive data, ultrasonic in-display fingerprint scanning, facial recognition, and ultra-fast 5G and Wi-Fi 6E support. Enhanced stereo speakers with Dolby Atmos create immersive audio, making the device ideal for gaming, streaming, and professional multimedia experiences.

Description

With Samsung Galaxy S21 Series, you have the ability to record in 8K. Which means your videos are double the resolution of 4K video. Or use the 64MP camera for still shots that come out clear whether it’s day or night. Single Take AI transcends the usual restrictions of photo and video editing to capture life’s greatest moments in one single take. Samsung Galaxy S21 Series, made for the epic in every day.

Brand: Samsung


Operating System: Android 11.0


Ram Memory Installed Size: 12 GB


CPU Model: Snapdragon


CPU Speed: 2.84 GHz


Memory Storage Capacity: 128 GB


Screen Size: 6.8 Inches


Resolution: 1440 x 3200


Refresh Rate: 120


Model Name: Galaxy S21 Ultra 5G


Operating System: Android 11.0


RAM Memory Installed: 12 GB


Processor Series: Snapdragon


Processor Speed: 2.84 GHz


Memory Storage Capacity: 128 GB


Color: Phantom Silver


SIM Card Slot Count: Single SIM


Connector Type: USB Type C


Form Factor: Bar


Biometric Security Feature: Fingerprint Recognition


Human-Interface Input: Touchscreen


Sim Card Size: Nano


Water Resistance Level: Water Resistant


Headphones Jack: 3.5 mm


Flash Memory Supported Size Maximum: 128 GB


Front Photo Sensor Resolution: 40 MP


Rear Facing Camera Photo Sensor Resolution: 108 MP


Camera Description: Front


Shooting Modes: High Dynamic Range


Number of Rear Facing Cameras: 4


Number of Front Cameras: 1


Battery Capacity: 5000 Milliamp Hours


Battery Description: Lithium-Ion


Battery Power: 5000 Milliamp Hours


Battery Average Life: 18 Hours


Phone Talk Time: 24 Hours


GPS Geotagging Functionality: True


Supported Satellite Navigation System: GPS


Screen Size: 6.8 Inches


Resolution: 1440 x 3200


Refresh Rate: 120


Display Type: AMOLED


Aspect Ratio: 149


Display Resolution Maximum: 3200 x 1440 Pixels


Display Pixel Density: 515.16 Pixels Per Inch (PPI)


Wireless Provider: Unlocked


Cellular Technology: 5G


Connectivity Technology: Bluetooth


Wireless Network Technology: CDMA, GSM, Wi-Fi


Brand: Samsung


Model Year: 2021


Built-In Media: Charging Cable


Manufacturer: Samsung Electronics


Model Series: S21


Specific Uses For Product: photography, streaming, video conferencing, gaming, productivity work


UPC: 686457991605


Warranty Description: 90 Day Limited Warranty


Item Weight: 7.68 ounces


Item Dimensions: 6.5 x 2.98 x 0.35 inches


Effective Video Resolution: 7680 Pixels


Video Capture Resolution: 1080p


Frame Rate: 24, 30, 60 fps


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Apr 30

Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Good phone so far
Luv the phone it has the best camera on a phone I've ever had shots are clear and precise. Zoom is clear first time I've had a phone where the zoom is clear especially when taking pictures of birds it actually looks like one actually the Samsung Galaxy s21 ultra camera is by far better than the Samsung Galaxy s25 ... show more
Reviewed in the United States on March 15, 2026 by angelsrone
    • I thought they made a mistake at first!
I bought this as a refurbished phone, and the price was appropriate. However, I was pretty sure they had messed up and sent me a brand-new phone. This thing is literally perfect, without a scratch or blemish anywhere. It also came with a screen protector already applied which was nice. The only criticism I have at all is that the battery literally had 1% left when I turned it on to start setting it up. It died completely while I was adding my Google creds, so I had to charge it up. No biggie, as I got the wireless charging thing too. Great phone, stupid-fast and AMAZING screen. Looking forward to getting it exactly right. If they had fractions of stars I would give this a 4.9. ... show more
Reviewed in the United States on January 11, 2024 by Nunja Business
    • Do not buy! No support! Dead phone!
I ordered this phone January 28th. Everything went ok with the phone for a couple months. It came in like-new condition and worked well. I was satisfied with it for a short while. However, in June, Samsung sent out UI6.1 Update. That update disabled the touchscreen for hundreds of S21's and other models. Check their Community forum where people are furious. I tried everything to get it back. Luckily I had a USB mouse to restart the phone and navigate. There is NO SUPPORT here on Amazon. It directs you back to Samsung dot com. When I chatted with Samsung support they were of no help and only offered a new phone at a discount. They told me NOT to buy my phone here. Amazon is not an authorized retailer even though it says "Samsung" as the seller. I still have the chat logs to prove this. A theory from news outlets is that resellers are using non-OEM screens which don't work with the new system updates. Long story short, don't buy a Samsung as they will brick your phone and not help you. Don't buy here as it is not an authorized seller and potentially used non-OEM parts that don't work with updates. ... show more
Reviewed in the United States on September 30, 2024 by Jonathan
    • Worth it!!
Needed a phone, and upgraded to this one. Saved a good amount of money too. Was hesitant at first, but happy I went with this one. Absolutely no problems with the phone, everything works 100%. Has slight cosmetic wear, but thats to be expected with a refurbished item. 10/10 would buy another phone from here. ... show more
Reviewed in the United States on January 3, 2026 by Brandon Moon
    • Screen doesn't respond
Personal and work use. The only problems that I have is the display. Fisrt it doesn't take screenshots with the side of the hand when I swipe it. I went to settings follow the Instructions and still doesn't work. Also sometimes it closes the app that I'm using by itself. Other than that is in perfect condition. ... show more
Reviewed in the United States on March 7, 2024 by Antonio Garcia
    • Good quality
Just as advertised on time great quality I would definitely buy again
Reviewed in the United States on April 19, 2026 by Doen pringle
    • Better than expected!
This is by no means a long term review and more like my initial observations. First of all, the phone arrived quickly and safely due to the requirement of a code to receive the package. This may seem inconvenient but actually protects us as buyers and also the seller. The phone came packaged in a generic box, but it was neatly packed with a USB A to USB C cable and a cheap charging brick which surprised me. The phone didn't have that "brand new" shine to it, but it looked new enough. There were no scratches or blemishes that I could find. After about and hour, I thought I detected a large horizontal scratch across the screen from a certain angle, but after unnecessarily peeling off the screen protector, I found the screen to be flawless. I was able to set this phone up with ESim on my Visible account in minutes and this phone is lightning fast with decent battery life. I used it hard for 8 straight hours just to be sure it would survive my typical work day. So far, I'll have to say that this is one of the best phones you can buy for around $400. ... show more
Reviewed in the United States on May 29, 2023 by Jay Chambliss
    • Buyer Beware
I do not recommend this. I don't usually take selfies, so it took me a few weeks before I noticed that there was damage to the front camera. (There were three black spots that showed up in the pictures. I'm not sure if there's something under the screen or if it was just damage.) Since it was over the time period allowed for refunds, I kept it since it didn't bother me too much. However, perhaps two weeks later, I noticed that the screen had started to lift in one corner. I've had a phone protector on it since I first turned it on. However, despite the phone protector being on, when I dropped the phone from a TWO FEET height, the phone cracked, starting from the lifted corner and it traveled down the side and middle of the screen. A week ago, the phone started having issues with charging (slow charging and it keeps starting and stopping). Now, the screen won't even turn on despite my phone being charged. I only had this phone for 9 months! I feel like I was scammed and ripped off. If I could go back, I wouldn't even waste/pay a penny for this phone. I've never had this experience with a phone. I never even had a phone's screen crack on me. I had my last phone for 6 or 7 YEARS (Galaxy 8+), and it was (and is) in better condition than this phone! I'm extremely disappointed in Amazon and this seller or whoever "refurbished" this phone. ... show more
Reviewed in the United States on July 31, 2025 by American Express

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