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5G Dynamic AM-OLED IP68 Smartphone

Samsung SM-G991D Galaxy S21 5G UW TD-LTE JP 256GB SC-51B / SGH-N649 (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 variant is the Japanese carrier model (SM‑G991D) that adds Ultra Wideband support and TD‑LTE connectivity for the JP market. It is identified by the specific model numbers SC‑51B / SGH‑N649 and carries a slightly higher weight of 171 grams compared to the base model. While it shares the core specifications with other S21 5G versions, these carrier‑specific identifiers and the modest weight increase set it apart from the base model and the other listed regional variants.

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
TD-NR · 3 bandsLTE · 12 bandsTD-LTE · 5 bandsUMTS · 4 bandsGSM · 4 bands
All TD-NR bands (3)
  • TD-NR 28 GHz (N257) bands
  • TD-NR 3500 MHz (N78)
  • TD-NR 4700 MHz (N79)
All LTE bands (12)
  • LTE 1500 MHz (Band XXI)
  • LTE 1700/2100 MHz (Band 4, AWS)
  • LTE 1800 MHz (Band 3)
  • LTE 2100 MHz (Band 1)
  • LTE 2600 MHz (Band 7)
  • LTE 700 MHz (Band 12)
  • LTE 700 MHz (Band 13)
  • LTE 700 MHz (Band 28)
  • LTE 800 MHz (Band 18)
  • LTE 800 MHz (Band 19)
  • LTE 800 MHz (Band 20)
  • LTE 850 MHz (Band 5)
All TD-LTE bands (5)
  • 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 3500 MHz (Band XLII)
All UMTS bands (4)
  • UMTS 2100MHz (Band I, IMT)
  • UMTS 800MHz (Band VI)
  • UMTS 800MHz (Band XIX)
  • UMTS 850MHz (Band V, CLR)
All GSM bands (4)
  • GSM 1800MHz (B3)
  • GSM 1900MHz (PCS, B2)
  • GSM 850MHz (B5)
  • GSM 900MHz (B8)
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
Nano-SIM (4FF)
Carrier
NTT DoCoMo
Markets
Asia (Japan)
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
Preliminary

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)

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No image available

Samsung Galaxy S21 5G

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

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No image available

Samsung Galaxy S21 5G

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

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Samsung Galaxy S21 5G

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

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Samsung Galaxy S21 5G

Samsung SM-G991U Galaxy S21 5G UW Dual SIM TD-LTE US 128GB / SM-G991R4 (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-G991T (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-G991V (Samsung Unbound M1)

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Samsung Galaxy S21 5G

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

View Specs
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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
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Samsung Galaxy S21 5G

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

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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)

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