Samsung Galaxy S21 128GB 5G Smartphone (Unlocked, Phantom Gray)

BH #SAGAS21128G • MFR #SM-G991UZAAXAA
Samsung Galaxy S21 128GB 5G Smartphone (Unlocked, Phantom Gray)
Key Features
  • GSM + CDMA / 4G LTE + 5G Compatible
  • North American Variant
  • Triple Camera System (12MP, 12MP, 64MP)
  • Ultra-Wide, Wide & Telephoto Cameras
Never let a moment be missed with the Samsung Galaxy S21 128GB 5G Smartphone, which features a triple camera system and a host of pro-grade AI-supported technologies. The 12MP ultra-wide, 12MP wide, and 64MP telephoto lenses can capture a wide variety of still image types, while also allowing you to capture videos at up to 8K. With 8K video support, you can use the 8K Video Snap feature to pull out 33MP hi-res frames from within clips, so you can ensure that you never miss a chance of saving and sharing specific moments.
No Longer Available
This device is unlocked and should work fully with carriers listed below with green bars. Yellow bars denote partial network coverage. A SIM card and service plan must be purchased separately. Network compatibility listed here is for reference only and does not guarantee phone compatibility or activation on CDMA Carriers.
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Samsung S21 SM-G991U Overview

  • 1Description
  • 2GSM + CDMA / 4G LTE + 5G Wireless Connectivity
  • 3North American Variant / US Compatible 5G
  • 4Single Take
  • 5Director's View
  • 6Super Steady
  • 7Portrait Modes
  • 8Space Zoom
  • 9Eye Comfort Shield
  • 10Wireless Charging
  • 11Priority Mode
  • 12Knox Vault
  • 13One UI 3
  • 14Motion Mirror
  • 15Additional Features

Never let a moment be missed with the Samsung Galaxy S21 128GB 5G Smartphone, which features a triple camera system and a host of pro-grade AI-supported technologies. The 12MP ultra-wide, 12MP wide, and 64MP telephoto lenses can capture a wide variety of still image types, while also allowing you to capture videos at up to 8K. With 8K video support, you can use the 8K Video Snap feature to pull out 33MP hi-res frames from within clips, so you can ensure that you never miss a chance of saving and sharing specific moments.

What you see on the Samsung S21 is just as good as what you can record, with a stunning 6.2" Dynamic AMOLED 2x screen with an adaptive refresh rate of up to 120 Hz. AI detects the content you are viewing and alters the refresh rate automatically, between 48 to 120 Hz, giving you a smooth scrolling experience when you need it, and preserving battery life when you don't. Gorilla Glass Victus protects the display with extremely durable damage and scratch resistance. A tiny hole in the Infinity-O display accommodates a 10MP camera to handle your selfies.

The screen on the Samsung S21 is how we experience all of what a smartphone can offer us, and much of that content is streamed to us via the internet. From streaming movies and TV shows to online gaming. This is why Samsung equipped the S21 with 5G support in both Sub-6 and mmWave network frequencies, maximizing your ability to utilize the blazing fast speeds that 5G can offer. The phone also supports Wi-Fi 6E, which expands home and public network support into the latest 6 GHz spectrum for more stable connections and the fastest bandwidth possible.

GSM + CDMA / 4G LTE + 5G Wireless Connectivity
This phone is designed to work on select CDMA, GSM & 5G networks, including sub-6 and mmWave. 5G is a cellular network data protocol capable of extremely fast data speeds that rival, or surpass, that of wired broadband Internet providers. 5G speeds can vary considerably based on location, but on average, should have no problem streaming 4K video. As 5G upgrades over time, mobile AR and VR applications could become possible. The phone is backwards compatible with 4G LTE, 3G, and 2G data for locations that do not support 5G.
North American Variant / US Compatible 5G
The SM-G991 is a North American variant of the S21 5G. It may be used in other parts of the world; however, 5G access may be limited or unsupported, depending on the network. Please choose your country/carrier above to confirm the network compatibility of this phone.
Single Take
With Single Take, integrated AI snaps a variety of Instagram-ready photos and videos (up to 15 seconds) with a single tap, letting you pick the perfect shot or video to share.
Director's View
Like a director on a big Hollywood production, you too can film with multiple cameras at once. As you record, Director's View will show you thumbnails of what each camera can see, letting you switch between them on the fly, giving your resulting video a more professional look and save you some editing time later.
Super Steady
This feature works to remove the shakiness that comes when moving as you film, resulting in smooth videos akin to what you would get with an action cam.
Portrait Modes
The 10MP selfie camera does not just simply take your photo. It uses integrated AI to bring out your features, ensure true-to-life color, and provide fast autofocus. You also get multiple portrait modes to get creative with what you share online. Choose from your original AI-enhanced photo, Blur, Studio, High-Key Mono, Low-Key Mono, Backdrop, or Color Print.
Space Zoom
If you can't get to your subject, bring it to you with Space Zoom. A 30x digital zoom ability lets you focus on people and objects far in the distance, and with Zoom Lock, your subject will remain centered so you can more easily capture a photo or video.
Eye Comfort Shield
More and more, smartphones are becoming our window in which we view the world. With so much time spent staring at a digital screen, Samsung created Eye Comfort Shield. It's an AI-based technology that will automatically adjust the blue light emitted from your phone to help minimize eye strain.
Wireless Charging
With support for Fast Wireless Charging 2.0, you can recharge the S21 without the need of a cable. You can also use the S21 to charge other devices. With Wireless PowerShare support, you can place another compatible Galaxy smartphone or Galaxy Buds onto the S21 to give them a quick recharge.
Priority Mode
Whether you're going up against an AI or human opponent, victory requires focus. With Priority Mode engaged, calls are blocked as you play.
Knox Vault
Samsung provides a dedicated chip to help ensure that your data and personal information remain safe. It also encrypts your biometric data that you can use to more easily unlock your phone.
One UI 3
Enhancing the Android operating system is Samsung's One UI 3, which delivers a plethora of features to make using the S21 easier and more convenient. Some features include the ability to have multiple widgets on your lock screen, so you can see more info at-a-glance. You can also customize a widget's size and opacity. There's also an object eraser ability that lets you edit photos to remove unwanted people or objects with a few taps.
Motion Mirror
This feature lets you view yourself on your TV via the S21's camera as you work out, helping you better replicate exercises and forms being demonstrated by an instructor.
Additional Features
Smooth 60 fps video at 1080p
4000mAh battery for all-day power
Large ultrasonic fingerprint reader
IP68 water and dust resistance
Compatible with Google Duo
Support for Samsung Pay

Samsung S21 SM-G991U Specs

Key Specs
Operating System
Android 11
Display Size
6.2"
Native Resolution
2400 x 1080
Ports
1x USB-C (USB 3.0 / 3.1/3.2 Gen 1)
Wi-Fi
Wi-Fi 6E (802.11ax)
Camera System
Rear
Telephoto: 64 MP 1/1.76"-Type Sensor (0.8 µm Pixels) with a 28mm f/2.0 Lens
Wide: 12 MP 1/1.76"-Type Sensor (1.8 µm Pixels) with a 26mm f/1.8 Lens
Ultra Wide: 12 MP 1/2.6"-Type Sensor (1.4 µm Pixels) with a 13mm f/2.2 Lens (120° FoV)
Front
Standard: 10 MP 1/3.2"-Type Sensor (1.22 µm Pixels) with a 26mm f/2.2 Lens
Performance
Operating System
Android 11
Memory
8 GB
Processor
Qualcomm Snapdragon888
CPU
2.84 GHz Kryo 680 Single-Core
2.42 GHz Kryo 680 Triple-Core
1.8 GHz Kryo 680 Quad-Core
GPU
Adreno 660
Storage
128 GB
Display
Display Size
6.2"
Native Resolution
2400 x 1080
Refresh Rate
120 Hz (at Max Brightness)
Aspect Ratio
20:9
Pixel Density
421 ppi
Panel Type
OLED
Screen Coating
Gorilla Glass Victus
Input/Output Connectors
Ports
1x USB-C (USB 3.0 / 3.1/3.2 Gen 1)
Speaker
2
Media/Memory Card Slot
No
SIM Card Slots
1x Nano SIM
Communications
CDMA 2G
CDMA: 800, 1900 MHz
GSM 2G
GSM, GPRS, EDGE: 850, 900, 1800, 1900 MHz
CDMA 3G
CDMA2000, EV-DO: 800, 1900 MHz
GSM 3G/3.5G
UMTS, HSPA+: 850, 900, 1700, 1900, 2100 MHz
4G LTE
LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 38, 39, 40, 41, 46, 48, 66, 71 Bands
5G NR
n2, n5, n25, n41, n66, n71, n260, n261 Bands
Wi-Fi
Wi-Fi 6E (802.11ax)
Bluetooth
Bluetooth 5.0 + LE 
NFC
Yes
GPS
Yes
ANT+ Support
Yes
FM Radio
Yes
Camera System
Camera System
Rear
Telephoto: 64 MP 1/1.76"-Type Sensor (0.8 µm Pixels) with a 28mm f/2.0 Lens
Wide: 12 MP 1/1.76"-Type Sensor (1.8 µm Pixels) with a 26mm f/1.8 Lens
Ultra Wide: 12 MP 1/2.6"-Type Sensor (1.4 µm Pixels) with a 13mm f/2.2 Lens (120° FoV)
Front
Standard: 10 MP 1/3.2"-Type Sensor (1.22 µm Pixels) with a 26mm f/2.2 Lens
Camera Flash
Rear: 1x LED
Focus Type
Rear Wide/Telephoto: Phase-Detect Autofocus
Front Standard: Phase-Detect Autofocus
Computational Photography
Multi-Camera Depth-of-Field Control (Portrait Mode)

Multi-Camera Dynamic Range Enhancement (HDR)

Multi-Camera Noise Reduction (Night Mode)
Video Recording
Rear
UHD 8K at up to 24 fps
UHD 4K at up to 60 fps
1080p at up to 60 fps (240 fps in Slow-Mo Mode)
720p (960 fps in Slow-Mo Mode)
Front
UHD 4K at up to 60 fps
1080p at up to 30 fps
General
Biometric Authentication
Fingerprint (Under-Screen)
Sensors
Accelerometer, Barometer (Altimeter), Compass, Fingerprint, Gyroscope, Proximity
Water Resistance
Resistant
IP Rating
IP68
Keyboard
Virtual
Pointing Device
No
Battery
Internal Lithium-Ion (4000.0 mAh)
Wireless Charging
Qi, PMA up to 15 W
Dimensions (W x H x D)
2.8 x 6.0 x 0.3" / 71.2 x 151.7 x 7.9 mm
Weight
6.0 oz / 171 g
Warranty Length
Limited 1-Year Warranty
Packaging Info
Package Weight
0.695 lb
Box Dimensions (LxWxH)
6.6 x 3.7 x 1.4"

Samsung S21 SM-G991U Reviews

See any errors on this page? Let us know

can I just switch the sim card from my Verizon ...

can I just switch the sim card from my Verizon note 8 into this phone? and will it work?
Asked by: Michael
Yes, the Samsung Galaxy S21 256GB 5G Smartphone (Unlocked, Phantom Gray) BH #SAGAS21256G is compatible with Verizon and you can just switch your sim card.
Answered by: nancyg
Date published: 2021-05-03

Does this phone [Samsung Galaxy S21 128GB 5G ...

Does this phone [Samsung Galaxy S21 128GB 5G Smartphone (Unlocked, Phantom White)] work on Visible Wireless?
Asked by: Patrick
Yes, this item would be compatible with the Visible wireless service.
Answered by: dariusb
Date published: 2021-04-25

Does the US unlocked version of this phone allow ...

Does the US unlocked version of this phone allow the user to turn off 5G? I know the T-mobile version does.
Asked by: Michael
It depends on what provider you are with. T-Mobile allows for you to turn off 5G but Verizon does not.
Answered by: nancyg
Date published: 2021-04-19

Can you confirm this phone (SM-G991UZAEXAA) has ...

Can you confirm this phone (SM-G991UZAEXAA) has an eSIM? TIA
Asked by: Jim
This does not have an eSIM.
Answered by: Nilson D
Date published: 2021-04-14

I do have a Metro PCs old galaxy J7 can I just ...

I do have a Metro PCs old galaxy J7 can I just use the SIM card in the S21 or must get new one in T-mobile the new carrier?.
Asked by: Daniel C.
Yes, both phones use the same size sim card.
Answered by: Geoffrey
Date published: 2021-04-13

I have metro PCs old galaxy j7. Can just install ...

I have metro PCs old galaxy j7. Can just install my SIM card or I have to get new one from T-mobile the new carrier?
Asked by: Daniel C.
You would need to get a new one from your carrier.
Answered by: Nilson D
Date published: 2021-04-13

Does this phone feature Wifi Calling?

Does this phone feature Wifi Calling?
Asked by: Brian
The Samsung Galaxy S21 256GB 5G Smartphone (Unlocked, Phantom Gray) BH #SAGAS21256G is wifi calling capable. However, you have to double check with your carrier for compatibility.
Answered by: Nancy
Date published: 2021-04-06

Will this phone work on AT&T cell network USA?

Will this phone work on AT&T cell network USA?
Asked by: Francis
Yes, the Samsung Galaxy S21 128GB 5G Smartphone (Unlocked, Phantom Gray) BH #SAGAS21128G works on AT&T.
Answered by: Nancy
Date published: 2021-03-24
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