Search  for anything...
Samsung

Samsung Galaxy S21 Ultra 5G, US Version, 512GB, Phantom Black - Unlocked (Renewed)

  • Based on 344 reviews
Condition: Refurbished - Excellent
Checking for the best price...
$349.99 Why this price?
Save $649.01 was $999.00

Buy Now, Pay Later

As low as / mo
  • – Up to 36-month term if approved
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

90-day refund / replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 1 left in stock, order soon!
Fulfilled by Amazon
Arrives Monday, Mar 9
Order within 6 hours and 40 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Service provider: Unlocked


Color: Phantom Black


Size: 512GB


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

Unleash a new era of mobile supremacy with the Samsung Galaxy S21 Ultra 5G SM-G998U, where innovation meets unmatched excellence. Dive into an immersive visual extravaganza on its expansive display, captivating your senses with vibrant details and stunning colors. Elevate your photography game with an advanced camera system that turns every moment into a visual masterpiece with extraordinary precision. Powered by a formidable processor, this device ensures a seamless and responsive performance, effortlessly adapting to your dynamic lifestyle. The Galaxy S21 Ultra 5G keeps you powered throughout your day, while intuitive features enhance your daily tasks. Immerse yourself in the Samsung ecosystem, offering a seamless interface and unlocking a plethora of functionalities. This sleek and resilient companion goes beyond being a mere phone; it's a symbol of Samsung's commitment to delivering an unparalleled smartphone experience. Redefine your mobile journey and indulge in the extraordinary with the Samsung Galaxy S21 Ultra 5G SM-G998U — where cutting-edge innovation meets an unprecedented level of excellence.

Brand: Samsung


Operating System: Android


Ram Memory Installed Size: 12 GB


CPU Model: Snapdragon


CPU Speed: 2.42 GHz


Memory Storage Capacity: 512 GB


Screen Size: 6.8 Inches


Resolution: 3200 x 1440


Refresh Rate: 120


Model Name: Samsung Galaxy S21 Ultra 5G


Product Dimensions: 6.5 x 2.98 x 0.35 inches


Item Weight: 7.7 ounces


Item model number: Galaxy S21 Ultra 5G


Batteries: 1 Lithium Ion batteries required.


Is Discontinued By Manufacturer: No


Date First Available: June 7, 2021


Manufacturer: Samsung Electronics


Memory Storage Capacity: 512 GB


Standing screen display size: 6.8 Inches


Ram Memory Installed Size: 12 GB


Battery Capacity: 5000 Milliamp Hours


Item Weight: 0.48 Pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Mar 9

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • The condition awesome.
This cell phone arrived in excellent condition. Practically new even with all the horror stories I've heard, I was so amazed and very happy with this product and the seller, a 100%.
Reviewed in the United States on January 13, 2026 by frances
    • Make the switch and upgrade - its so worth it!
The phone is in excellent condition as offered. I was pleasantly surprised with the quality and very please with the condition. A little wear and tear around the camera area where a case had been and a light cosmetic tiny scratch on the front glass. In all, I'm very happy with my purchase. The quality of the phone is amazing and I only wish I bought new when I had the opportunity. This is an S21 Ultra 5G with 512gb and 16Gb of ram. There's some confusion as to whether you'll get a 12gb or 16gb. This was a 16gb version. The Samsung Switch app can be used to move your old phone over to the new phone (apps, data, email, etc...) Both phones have to have full charges to work properly. This was well worth the investment. I use Google Fi and upon starting the phone after inserting the sim card, the phone switch over immediately and I was rocking 5g. This was a fantastic purchase! Thank you. ... show more
Reviewed in the United States on August 10, 2022 by John Bannon
    • She LOVES her new phone!!
Review Image by Nicki Blaze Nicki Blaze
Review Image by Nicki Blaze Nicki Blaze
Review Image by Nicki Blaze Nicki Blaze
Review Image by Nicki Blaze Nicki Blaze
Review Image by Nicki Blaze Nicki Blaze
Hi! Nicki_Blaze.711’s friend here 👋🏻 Got this as a gift as a surprise for her and she’s absolutely loving it. She’s been off socia media for a while and I wanted to inspire her to get back to what she loves and I believe it’s working! She’s been testing it out all week and says it works just like new and has zero wear or tear on it. It does overheat sometimes but that’s with her usually either gaming on it all day and night for her social media WHILE live-streaming or chatting on discord at the same time AND screen recording her gaming for video future content. It’s able to handle all her Likee, Mico, and Tiktok needs! How she does it all I have no clue lol. She says it charges super fast and can handle a lot, so if you’re interested in grabbing this phone for yourself definitely go for it. She hasn’t tested the camera out on her cosplay and makeup looks just yet but she said the camera features are amazing and are going to take her content to the next level. Super excited to see her start posting again. A special thanks to the seller on sending it to me so quickly👍🏻 ... show more
Reviewed in the United States on May 30, 2023 by Nicki Blaze Nicki Blaze
    • It's still the best phone you can get IMO
This phone is kinda like a jack of all trades. Maybe when the S24 or 25 comes out, I'll get the Exynos variant, just because they spent more time developing the newest chip, it's actually made by Samsung and I heard they're easier to root. It used to be easy to root Samsung phones but now it's next to impossible and temporary if you do, before they update it. This phone is one of like 3 phones that has stylus support, a curved screen and 120hz. I wish the thing had a 1TB option or Micro SD Card support but everyone loves to copy Apple for some reason, even after making fun of them/boasting about features their phones still have. Just like with the headphone jack. I'm personally into buying or building products/devices with the least amount of brands/manufacturers, so the fact that this phone is pretty much entirely made by Samsung this year, even the Qualcomm chips, is pretty cool. I feel like GoodLock is getting more and more stuff added, for personal customization, though I wish they'd stop changing the way you can screenshot, so I don't have to keep finding workarounds. Even though there are some things they tried to take away, this phone still allows more customization than any other phone, maybe except Xiaomi. Xiaomi allows you to customize the boot logo/animation without root! eSIM WILL NOT work for Verizon or any of Verizon's MVNOs which is absolutely ridiculous. It's sucks enough that you can only store 2, only 1 can be used in junction with the regular SIM and that's fine but why does any eSIMs beyond 2 get deleted? Who knows... These speakers are loud and the Snapdragon 888 is still a great option for emulation or Android games. It doesn't get too hot and the battery can last you quite a while, even for a heavy user like Me, who downloads a million apps and keeps quite a few things in the background. It's still snappy and works as it should. The cameras are decent, probably not as good as My Pixel 5, but it's close. The charging speed, I'm used to it now but 25w? Come on... even older phones had at least 45w, but I guess Sammy was afraid more phones would go boom boom. At it's fastest rate, it will charge from around 5-10% to 100% in a little over an hour. I do love that there are so many options for accessories, since Samsung's phones are such a global phenomenon. I didn't pay much to get this phone refurbed and I just don't personally think it can be beat. The sides had a bunch of micro scratches that I just covered with a clear case, which had a Black frame, that I put on top of a skin. For the money I paid, it's nice to have a curved 120Hz 1440p LTPO screen with a ultrasonic fingerprint reader (even though it's a bit slower than it should be) and stylus support, 512GB of storage, 16GB of RAM, a Snapdragon 888, DeX/HDMI Out, a 5000mAh battery, wireless charging, reverse wireless charging (even though it's super slow), a front facing camera in the middle of the screen at the top (though it'd be nice if this was under the display or just didn't exist), IP67 or 8 water resistance, extremely loud speakers, eSIM, the latest One UI + Android Security Patches until 2024 I believe, etc. I have a lot to say about this phone but overall, if you can find it for $700 or less, its a great phone and probably the last one that will be this curvy and feature packed. ... show more
Reviewed in the United States on September 22, 2023 by AnthonyMooreDevices
    • Good product
Good product. I would suggest a sturdy case, but it has lasted.
Reviewed in the United States on February 17, 2026 by 97scoobydoo
    • Phone may not be usable with any provider as mine came locked.
This phone was not as advertised. It came locked by an unknown provider and thus useless to anyone. $350 wasted. Still no customer support.
Reviewed in the United States on November 21, 2025 by Jeremy Bentley
    • Cheerful Samsung smartphones
Hi, very beautiful Samsung smartphone. The screen was so clear and did not strain the eyes at all. Happy to see the item. On time delivery. Appreciated.
Reviewed in the United States on December 15, 2025 by Mountain
    • Is a used/refurbished phones, be aware.
Great phone, aside from the front facing camera not working (when I change to it from rear camera to front says "camera failed"). After researching the issue, it seems it may be a program issue or a connection problem. Should be a simple fix. Came unlocked with the 500gb storage as I purchased, and the proformance is so far great. The battery is slightly worn, and has a shorter life then if it were brand new, but that is to be expected. I had some issues with wifi and bluetooth, but after messing with settings I fixed it. It came in great shape visibly, no scratches. Would recommend, but with the warning of these are used/refurbished phones that could come with issues. ... show more
Reviewed in the United States on February 12, 2026 by Wendy

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...