Everything for Back to School — and then someShop now

Skip to contentGo to Product Search
Main Content

Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray

Model: SM-G991UZAEXAA
SKU: 12032103
Sold & shipped by

About this product

With Galaxy S21 5G, 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. Galaxy S21, made for the epic in every day.

Features
  • Life moves fast. S21 moves faster.

    Transform your story sharing, live streaming, video-editing and multi-tasking with hyperfast processor speeds (Compared to GS20)

  • Universal Unlocked

    Compatible with all major U.S. carriers, including Verizon, AT&T, Sprint, and T-Mobile. Also compatible with prepaid carriers, including Cricket Wireless, Boost Mobile, MetroPCS, Simple Mobile, Total Wireless, Tracfone, Net10, Mint, and H2O.

  • Connectivity built for today. And tomorrow.

    Built with 5G connectivity in mind, you can share, scroll, browse and binge in a flash(1).

  • A camera so good, everyone’s a pro

    Zoom in close, take photos and videos like a pro, and capture incredible share-ready moments with our easy-to-use, multi-lens camera.

  • Trust us, you'll look amazing in 8K video

    A night out. Your best friend’s birthday party. Family moments you’ll want to remember forever. Capture your life’s best moments in head-turning, super-smooth 8K video.

  • Movie-making magic in the palm of your hand

    Slide into the director’s chair and create share-ready videos on the spot with multi-cam recording and automatic pro-style effects.

  • Spontaneity, now captured from multiple angles

    Create share-ready GIFs and videos in a single take(2) or pick your favorite moments and pull your favorite stills in super high-res to share with your followers.

  • It’s real life. But in really high-resolution.

    If beauty is in the details, you’ve got plenty of it here. 64MP high resolution captures everything with share-ready clarity.

  • Pinch, zoom, and you’re there

    Too far? No such thing with 30x Space Zoom. Get more stability with Zoom Lock and never lose your focus.

  • Easy on the eyes — day or night or somewhere in between

    Our 6.2" adaptive 120Hz display makes scrolling feel faster and silky smooth while also being easy on the eyes. Outside, inside, day or night (Compared to 60Hz screens).

  • All your photos are keepers. So keep ‘em.

    Every moment matters. Hold on to them with S21 5G’s extensive built-in storage (4).

  • All day battery, and then some(5). No charging(6).

    Power every scroll, click, tap, and stream all day long and then some(5) with an intelligent battery that works with you, not against you.

  • A striking new phone design — may cause phone envy

    Modern haze finishes with an all-new integrated metal camera design and our toughest glass on a smartphone. Groundbreaking — it’s a vibe. And it looks good on you.

  • (1)Requires optimal 5G network connection, available in select markets. Check with your carrier for availability and details. Download and streaming speeds may vary based on content provider, server connection and other factors.

  • (2)Single Take captures images and video up to 15 seconds.

  • (3)Compared to GS20

  • (4)S21 available in 128GB and 256GB.

  • (5)Based 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.

  • (6)Charger not included; use only Samsung-approved chargers and cables; do not use any worn or damaged chargers or cables; incompatible charger or cable can cause serious injuries or damage to your device.

  • * SIM Card not included.

See all features
Specifications
  • Screen Size
    6.2 inches
    Rear-Facing Camera
    12 megapixels
    Carrier Compatibility
    AT&T, Sprint, T-Mobile, Google Fi, Verizon, Cricket, Mint Mobile, Simple Mobile, H2O Wireless, Ting Mobile, Ultra Mobile, MetroPCS
    Phone Memory (RAM)
    8 gigabytes
Sponsored

Reviews

Rating 4.7 out of 5 stars with 46 reviews

93% would recommend to a friend

Customer Images

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

  • Rated 5 out of 5 stars

    Great Phone with Superior Picture Quality

    I have had this phone for around 6 months now as a replacement for a Samsung S8 and it connects faster to my vehicles Bluetooth and now works with my Samsung Level wireless headphones without freezing my phone which happened with the old S8. It takes such bright and clear pictures that I never use my Canon cameras anymore. I decided to get my $1,300 Canon EOS 7D with the attached $500 Canon 17-40 L Series Wide Angle Zoom out of the safe yesterday to compare the images. The polarized lens cover produced poor pictures so I replaced that with just a clear lens cover. Today in bright sunlight I took several pictures with the Canon and the Samsung S21 5G. The results convinced me to just put the Canon EOS 7D back into the safe since the Samsung S21 5G pictures were far superior as far as brightness and clarity. See the attached comparison pictures for yourself.

    This review is from Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray

    Posted by mike89052

  • Rated 5 out of 5 stars

    Ok

    I like this phone, i had to retunr it unfortunately because it had a factory problem.

    This review is from Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray

    Posted by Irms

  • Rated 5 out of 5 stars

    Outstanding phone!

    This device is gold. I sprung for the 256G option because there is no MicroSD support but the cost increase isn't great. In summary, the device is perfect fit for the hand, looks great, performs like a beast and makes minimal compromise. Unboxing / setup: There is minimal in the box, a USB-C to USB-C cable, documentation, a SIM tool and the phone. Setup takes some time if you are porting from another phone but the Samsung Smart Switch app makes it pretty easy where all you have to do is transfer all software, log in to Google and Samsung and it will do the rest, it just takes time to do so. Use: Battery life was lacking in the first few days but once it learned my habits after three or so days, I finish the day with 20% battery and 4-5 hours screen on time with 5G T-Mobile service in my area. I watch a lot of YouTube, read books, message, social media and game though out the day. What I was most impressed with is how well this phone fits in the hand. It is near perfect for small/medium hands. Most of the screen is reachable and one-handed texting is easy. The plastic back is a non-issue for me since it still feels premium and I use a case anyway. The Phantom Grey looks much better in person than in the product photos. The lack of Micro SD is a good move even if it is hard to swallow in my opinion. The reason I say this is the performance increase. Most faster Micro SD cards only read at 90 MBps whereas the UFS 3.0 built in provides 1748 MBps read, 756 MBps write which is outstanding! The price increase for the 128 GB is only $50 extra which is only a tiny bit more than a 128GB microSD card. I do understand the pain if you need more than 256GB though. Performance was a little choppy the first day or two as I assume the phone was indexing the filesystem and cleaning up after smart switch, but in the week since, zero issues. Performance on benchmarks is not on PAR with iPhones but you wouldn't notice in day to day use as apps open even faster. Camera: There is a bit of shutter lag, but if you can live with that, photos area AMAZING! I must disclose that the 3x camera is not optical in nature. It is a cropped 64MP sensor. Side by side to an S21 Ultra with an optical 10MP 3X, the difference is almost unnoticeable. The phone allows digital zoom up to 30x but I wouldn't go higher than 10x as it is unusable after that. There is no macro ability but if yo use the 3x, it gives you pretty close photos. Sound: Speaker quality is great! I can easily hear it playing music or podcasts while showering and it gets loud and clear. The phone supports all the big codecs via bluetooth and I recommend Samsung buds of any type as it supports a Samsung Scalable Codec. Display: I was worried about the 1080p display being too low, but it is an extremely good screen! It is bright, vibrant and detailed as the screen size is low. Connectivity: Calls are clear especially on HD calls. I have a Wifi 6 network and connection stays strong anywhere in my house. Switching from an iPhone 12 Pro, I noticed cellular signal on 4G LTE and 5G is stronger anywhere I am in comparison. I have got up to 650mbps via 5G midband as there is no mmwave in my area.

    This review is from Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray

    Posted by psyclopps

  • Rated 3 out of 5 stars

    Choice of Features makes Samsung anti-consumer

    The good: -This phone does have a very nice feel and good size to it (don't listen to people misrepresenting it as "plastic", the finish and material feel to me exactly like my last phone, the iPhone 11 Pro) -It is very fast with a great screen, 120 Hz is snappy, 5G seems a little faster than LTE but not that much honestly. -Battery life seems good so far. -Software works well, UI is just as intuitive as apple in my opinion. With more customization options. The bad: -No charger in the box, this is honestly an insult to someone who just switched from iPhone and needed a charger. What on Earth were the clueless Samsung folks thinking with this decision I'll never know. (Other than "oh let's do it if apple is doing it") -No headphone port. That was one of the reasons I was excited to switch back to Samsung, my old S8 had a headphone port which I was missing. Another insult to the consumer...how many people were actually giving feedback that they didn't want the port? Clearly they were just copying apple's anti-consumer behavior. -Why not have a black color option for all models? This gray is not bad but you'd have so many more people switching over if you had a proper black option in the entry model. Not everyone wants a huge phone (which is the only reason I didn't opt for the plus or ultra...this is a huge wasted opportunity for Samsung to capture a larger audience) -limited to just 256GB if I want a phone I can use with one hand? Either offer a 512GB option or give the ability to put a microSD card in. This was also a very sloppy decision by Samsung too. In general Samsung continues to throw away big opportunities to win over former iPhone customers. Get your act together Samsung, you have a chance to be better than Apple. I hesitated a lot before trying this phone...over things you could have easily fixed with minimal impact to your costs. And they would go a long way towards winning over hearts of consumers.

    This review is from Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray

    Posted by Sammy

  • Rated 5 out of 5 stars

    Samsung makes a good device.

    This is a very good device. Performs well for almost three years. good camera.

    This review is from Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray

    Posted by Judy

Compare similar products

Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray
Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray
4.7(46)

With Galaxy S21 5G, 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. Galaxy S21, made for the epic in every day.

Samsung - Pre-Owned Excellent Galaxy S21 5G 128GB (Unlocked) - Phantom Gray

The Galaxy S21 is the phone for business that lets you securely connect and collaborate anywhere. Discover new ways to collaborate with an impressive 8K camera and easily go from mobile to desktop to meetings with Samsung DeX. Keep your business data and personal information protected with a secure processor, Samsung Knox and the Knox portfolio. Work seamlessly in the way that works best for you with Microsoft and Link to Windows. Now you can easily optimize cellular and Wi-Fi connectivity by accessing the best network and plan at the moment, and stop paying more than necessary with monthly plans. Unlocked by Samsung smartphones work on most major U.S. networks and allow international business travelers to take advantage of lower local rates. When you get an Unlocked by Samsung smartphone, it has no pre-loaded carrier apps, so your organization can deliver a more predictable and consistent experience across devices and have greater freedom to customize device software. Inspiration is a fickle creature. The Galaxy S21’s intuitive camera lets you capture, share and collaborate in real time, no matter where you are. Be in front of the camera, behind the camera or both at the same time—Director’s View puts a whole new spin on the virtual tour. Connect all your devices with Wireless Samsung DeX and use your Galaxy S21 as the remote. Take conference calls on your TV, drag and drop files from your phone to PC or double your screens with the tap of a finger. The Galaxy S21 comes with a defense-grade security platform built in so you can rest easy. With multiple layers of protection, your device is safe from intrusion, malware and malicious threats. Keep your fleet of mobile devices in sync and in control from end to end. A complete set of cloud-based solutions eliminates the risk of user error for worry-free security, software updates, device setup and more. Part of Knox’s multi-layered security platform, the Galaxy S21’s Knox Vault is dedicated to protecting your PIN, password, pattern and Blockchain Private Key. And with biometric authentication, your private data stays private. Getting work done on your smartphone is more important than ever before. The Galaxy S21 comes integrated with Microsoft Office, OneDrive and Teams so you can easily access all your files, photos and reminders—whether you’re in the office, working from home or on the move.

Samsung - Galaxy S21 Ultra 5G 128GB (Unlocked) - Phantom Black

Galaxy S21 Ultra 5G is crafted so you don’t need to choose between video and photo. With a single tap, you can pull super-clear stills straight from high-resolution 8K video. Or if you’re looking to capture stunning photos, the 108MP camera feels like you’ve brought your own professional studio with you. Galaxy S21 Ultra 5G, designed to be epic in every way.

Samsung - Pre-Owned Excellent Galaxy S21 Ultra 5G 128GB (Unlocked) - Phantom Black
4.2(60)

The real metal finish on the main camera adds unity to the design and accentuates the luxury of the haze texture. It’s a bold new camera design in a category of its own. The 108MP sensor gives you the highest resolution possible on a smartphone. Featuring all new 12-bit processing that offers a wider range of colors for crystal clear shots. And with nona-binning technology, it even helps take in more light for great exposures in dark scenes. 108MP for so much detail, you can crop, crop and crop again. The New Dual Zoom lens system is faster and sharper than any zoom before, featuring a 10MP Dual telephoto lens and enhanced Super Resolution. It even has a Zoom Lock feature so you can stabilize shots while zooming. Now zoom up to 100X with clarity and precision. Shoot like a pro, with incredible details at 8K resolution and smooth action at 24 frames per second. It’s the highest resolution video available on a smartphone. Witness the fastest chip ever in a Galaxy. With a 5nm processor on board, you get seamless multitasking and a hyper-fast content streaming. The new battery in the Galaxy S21 Ultra 5G isn’t just big. It’s got the brains to match, intelligently learning your app usage to optimize power consumption. Get the power that outlasts the day even in 5G. A 120Hz refresh rate allows for the smoothest scrolling screen to keep up with all your feeds. It constantly adjusts for the best viewing experience, and even helps your battery last longer. Meet the most vivid and brightest display in a smartphone. Even the direct light of the sun can't stop your viewing pleasure. Thanks to our Eye Comfort Shield, it even intelligently adjusts blue light so your eyes won't feel so tired.

Pros for Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray
There were no pros for this productOverall Performance, Condition, Camera Quality, Battery Life, SizeThere were no pros for this productOverall Performance, Camera Quality, Condition, Battery Life, Speed
Cons for Samsung - Galaxy S21 5G 256GB (Unlocked) - Phantom Gray
There were no cons for this productFunctionality, Heat DissipationThere were no cons for this productThere were no cons for this product

Specs

Questions & Answers
  • Can this phone run Genshin Impact well?

    Hello, Anon. We would love to look into this further. Please reach out to us on Facebook at (http://m.me/samsungsupport) or Twitter at (https://twitter.com/messages/compose?recipient_id=18768513). We look forward to speaking with you. ^Kayla

    Answered by Samsung
    Samsung response
  • does this phone come with a charging cable and a SIM ejector tool?

    Yes, it came with both a charging cable and a SIM ejector tool. It does not come with a charging plug.

    Answered by TechHead
  • Does S21, S21+ and S21 Ultra come with free Galaxy Buds Pro or Galaxy SmartTag?

    You only got these if you preordered the phone and I believe you had to preorder it directly from Samsung. I did get the $100 Samsung Store/shop credit for preordering and might get the SmartTag free with my order.

    Answered by GumbyX
  • When unlocked, can it be taken to Mexico?

    Yes

    Answered by Galaxys21
  • is it single or dual Sim ???

    Single SIM

    Answered by Sammy
Ask a question
No content

Customers often buy these together

Sponsored

Similar products from outside of Best Buy

sponsored
Ask BlueAI

Finance Options

My Best Buy® Credit Card
Choose a benefit:Or
Buy Now, Pay Later
Lease to own

Finance Options

My Best Buy® Credit Card
Choose a benefit:Or
Buy Now, Pay Later
Lease to own