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5G Dynamic AM-OLED IP68 Smartphone

Samsung SM-G991U Galaxy S21 5G UW Dual SIM TD-LTE US 128GB / SM-G991R4 (Samsung Unbound M1)

Samsung · Announced Jan 2021

About Samsung Galaxy S21 5G

The Samsung Galaxy S21 5G fits comfortably in the hand with dimensions of 71.2 mm wide, 151.7 mm tall and just 7.9 mm thick, weighing a light 170 grams. Its single‑slot SIM tray keeps the profile sleek, while the front is dominated by a vivid Color AM‑OLED panel measuring 6.24 inches across. The screen delivers a sharp 1080 by 2400 pixel resolution, bringing vivid colours and deep blacks to everyday content.

Under the hood, the device runs Google Android 11 and is equipped with 8 GiB of RAM, providing smooth multitasking and responsive performance. A 4 000 mAh battery powers the phone throughout the day, and when it needs a top‑up, the wired charging system supports up to 15 watts. Together, these specifications give the Galaxy S21 5G a balanced mix of portability, visual quality and everyday usability.

This variant

This US‑market model carries the SM‑G991U designation with the SM‑G991R4 suffix and ships with 128 GB of storage. It weighs 171 g.

Among the listed Galaxy S21 5G versions it is the only one aimed at the United States with UW support, while the alternatives target Korea, China/Hong Kong, Japan, Canada or global markets. Most of those variants offer 256 GB storage or carry different carrier suffixes such as V, A, T, P or U1, and many are configured as dual‑SIM devices.

Technical Specifications

Display
Size
6.24 inch
Type
Dynamic AM-OLED
Resolution
1080x2400
Color depth
24-bit, 10-bit HDR
Panel
Samsung
Screen-to-body
86.9%
Active area
65 × 144.45 mm
Touch
Capacitive multi-touch sensing screen, 10-point
Punch-hole
Yes
Performance
Processor
Snapdragon 888 5G
CPU
Octa-core, up to 2.8 GHz
GPU
Qualcomm Adreno 660
Process
5 nm
Platform
Google Android
Memory
RAM
8 GiB
Battery
Capacity
4000 mAh
Type
Lithium-ion
Energy
15.52 Wh
Voltage
3.88 V
Charging
15W
Cameras
Main
4032×3024 · 2.2× optical visibility
Ultrawide
13 mm visibility
Main
29 mm visibility
Front
3648×2736 visibility
Dimensions
Size
71.2 × 151.7 × 7.9 mm
Weight
171 g
Water resistance
IP68
Connectivity
Wi-Fi
Wi-Fi 6
Wi-Fi services
DLNA, Miracast, Wi-Fi Direct, Wi-Fi Tethering, WiDi, Wi-Fi Calling (VoWiFi)
Bluetooth profiles
A2DP, A2DP with aptX codec, A2DP with aptX HD codec, AVRCP, DIP, GAVDP, HFP, HID, HSP, MAP, OPP, PAN, PBA, SAP, SPP
USB
USB Type-C reversible
USB services
USB charging, USB fast charging, USB Host, USB On-The-Go 1.3, USB On-The-Go 2.0, USB Power Delivery, USB Power Delivery 2.0, USB Power Delivery 3.0
NFC
NFC A, NFC B
GPS
GPS, GLONASS, Galileo, BeiDou, QZSS
GPS services
Simultaneous GPS (S-GPS), Assisted GPS, Kétfrekvenciás GPS, Geotagging, QuickGPS, QZSS
AV out
DisplayPort (Unspecified) · 3840x2160 (2160p) 4K UHD
NR · 3 bandsTD-NR · 1 bandsLTE · 11 bandsTD-LTE · 6 bandsUMTS · 5 bandsGSM · 4 bandsCDMA · 3 bands
All NR bands (3)
  • NR 1700/2100 MHz (N66)
  • NR 1900 MHz (N2, PCS)
  • NR 600 MHz (N71)
All TD-NR bands (1)
  • TD-NR 28 GHz (N261) bands
All LTE bands (11)
  • LTE 1700/2100 MHz (Band 4, AWS)
  • LTE 1700/2100 MHz (Band 66)
  • LTE 1900 MHz (Band 2, PCS)
  • LTE 1900 MHz (Band 25)
  • LTE 2600 MHz (Band 7)
  • LTE 600 MHz (Band 71)
  • LTE 700 MHz (Band 12)
  • LTE 700 MHz (Band 13)
  • LTE 700 MHz (Band 29)
  • LTE 850 MHz (Band 26)
  • LTE 850 MHz (Band 5)
All TD-LTE bands (6)
  • TD-LTE 1900 MHz (Band 39)
  • TD-LTE 2300 MHz (Band XL)
  • TD-LTE 2500 MHz (Band XLI)
  • TD-LTE 2600 MHz (Band 38)
  • TD-LTE 3600 MHz (Band 48)
  • TD-LTE 5900 MHz (Band XLVI)
All UMTS bands (5)
  • UMTS 1700/2100MHz (Band IV, AWS)
  • UMTS 1900MHz (Band II, PCS)
  • UMTS 2100MHz (Band I, IMT)
  • UMTS 850MHz (Band V, CLR)
  • UMTS 900MHz (Band VIII)
All GSM bands (4)
  • GSM 1800MHz (B3)
  • GSM 1900MHz (PCS, B2)
  • GSM 850MHz (B5)
  • GSM 900MHz (B8)
All CDMA bands (3)
  • CDMA 1900MHz (BC1/BC14, PCS)
  • CDMA 800MHz (BC0, 850)
  • CDMA 800MHz (BC10)
Audio
Channels
stereo
Output
USB Type-C
DAC
32-bit / 384 kHz
Sensors
Sensors
Accelerometer, Barometer, Compass, Gyroscope, Hall sensor, Heart rate sensor, In-screen fingerprint sensor, Light intensity sensor, Proximity sensor, Step counter
Features
Fingerprint
Yes (in-screen fingerprint sensor)
SIM
e-SIM (embedded) · Dual standby
Carrier
United States Cellular Corporation
Markets
North America (NA) (USA)
Extras
Haptic touch feedback
Software extras
Voice Command, Business card recognition, Navigation software, Augmented Reality (AR), Virtual Reality (VR) support, Intelligent personal assistant, Voice Recognition, Face Recognition
Regulatory
HAC
M3, T3
Data status
Final

Model Variants

17 other phones with the same base model: Samsung Galaxy S21 5G

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Samsung Galaxy S21 5G

Samsung SM-G9910 Galaxy S21 5G Dual SIM TD-LTE CN HK 128GB (Samsung Unbound M1)

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No image available

Samsung Galaxy S21 5G

Samsung SM-G9910 Galaxy S21 5G Dual SIM TD-LTE CN HK 256GB (Samsung Unbound M1)

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No image available

Samsung Galaxy S21 5G

Samsung SM-G991B/DS Galaxy S21 5G Global Dual SIM TD-LTE 128GB (Samsung Unbound M1)

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No image available

Samsung Galaxy S21 5G

Samsung SM-G991B/DS Galaxy S21 5G Global Dual SIM TD-LTE 256GB (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991D Galaxy S21 5G UW TD-LTE JP 256GB SC-51B / SGH-N649 (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991J Galaxy S21 5G UW TD-LTE JP 256GB SCG09 (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991N Galaxy S21 5G TD-LTE KR 256GB (Samsung Unbound M1)

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No image available

Samsung Galaxy S21 5G

Samsung SM-G991U Galaxy S21 5G UW Dual SIM TD-LTE US 128GB / SM-G991A (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991U Galaxy S21 5G UW Dual SIM TD-LTE US 128GB / SM-G991T (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991U Galaxy S21 5G UW Dual SIM TD-LTE US 128GB / SM-G991V (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991U Galaxy S21 5G UW Dual SIM TD-LTE US 256GB / SM-G991P (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991U Galaxy S21 5G UW Dual SIM TD-LTE US 256GB / SM-G991R4 (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991U Galaxy S21 5G UW Dual SIM TD-LTE US 256GB / SM-G991V (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991U1 Galaxy S21 5G UW Dual SIM TD-LTE US 128GB (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991U1 Galaxy S21 5G UW Dual SIM TD-LTE US 256GB (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991W Galaxy S21 5G Dual SIM TD-LTE CA 128GB (Samsung Unbound M1)

View Specs
No image available

Samsung Galaxy S21 5G

Samsung SM-G991W Galaxy S21 5G Dual SIM TD-LTE CA 256GB (Samsung Unbound M1)

View Specs

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