THE PHONE FILE · Samsung
Galaxy S21.
Know your phone. Look beyond the headline specs. Explore its hardware, reported SAR, and a more thoughtful way to use it.
01 / HARDWARE
The details, beautifully clear.
General
- Technology
- GSM / CDMA / HSPA / EVDO / LTE / 5G
- Announced
- 2021-01-14 22:28:09
- Model Names
- SM-G991B, SM-G991B/DS, SM-G991U, SM-G991U1, SM-G991W, SM-G991N, SM-G9910
Display
- Type
- Dynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak)
- Size
- 6.2 inches, 94.1 cm2 (~87.2% screen-to-body ratio)
- Resolution
- 1080 x 2400 pixels, 20:9 ratio (~421 ppi density)
- Protection
- Corning Gorilla Glass Victus
- Features
- Corning Gorilla Glass Victus Always-on display
Camera
- Main Camera
- Triple Camera: 12 MP, f/1.8, 26mm (wide), 1/1.76", 1.8m, Dual Pixel PDAF, OIS ; 64 MP, f/2.0, 29mm (telephoto), 1/1.72", 0.8m, PDAF, OIS, 1.1x optical zoom, 3x hybrid zoom ; 12 MP, f/2.2, 13mm, 120 (ultrawide), 1/2.55" 1.4m, Super Steady video
- Main Features
- LED flash, auto-HDR, panorama
- Video
- 8K@24fps, 4K@30/60fps, 1080p@30/60/240fps, 720p@960fps, HDR10+, stereo sound rec., gyro-EIS
- Selfie Camera
- Single Camera: 10 MP, f/2.2, 26mm (wide), 1/3.24", 1.22m, Dual Pixel PDAF
- Selfie Camera Features
- Dual video call, Auto-HDR
- Selfie Camera Video
- 4K@30/60fps, 1080p@30fps
Battery
- Type
- Li-Ion 4000 mAh, non-removable
- Charging
- Fast charging 25W ; USB Power Delivery 3.0 ; Fast Qi/PMA wireless charging 15W ; Reverse wireless charging 4.5W
Hardware
- Software (source record)
- Android 11, One UI 3.1
- Chipset
- Exynos 2100 (5 nm) - InternationalQualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China
- CPU
- Octa-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - InternationalOcta-core (1x2.84 GHz Kryo 680 & 3x2.42 GHz Kryo 680 & 4x1.80 GHz Kryo 680) - USA/China
- GPU
- Mali-G78 MP14 - InternationalAdreno 660 - USA/China
- Internal Storage
- 128GB 8GB RAM, 256GB 8GB RAM
- Card Slot
- No
- Sensors
- Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer
Connectivity
- Wi-fi
- Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct, hotspot
- Bluetooth
- 5.0, A2DP, LE
- USB
- USB Type-C 3.2, USB On-The-Go
- GPS
- Yes, with A-GPS, GLONASS, BDS, GALILEO
- NFC
- Yes
- Radio
- FM radio (Snapdragon model only; market/operator dependent)
Sound
- Loudspeaker
- Yes, with stereo speakers
- 3.5mm Jack
- No
Design
- Type
- Bar
- Dimensions
- 151.7 x 71.2 x 7.9 mm (5.97 x 2.80 x 0.31 in)
- Weight
- 169 g (Sub6), 171 g (mmWave) (5.96 oz)
- Colors
- Phantom Gray, Phantom White, Phantom Violet, Phantom Pink
- Build
- Glass front (Gorilla Glass Victus), plastic back, aluminum frame
Network
- Speed
- HSPA 42.2/5.76 Mbps, LTE-A (CA), 5G
- SIM
- Single SIM (Nano-SIM and/or eSIM) or Dual SIM (Nano-SIM and/or eSIM, dual stand-by)
- 2G Network
- GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (Dual SIM model only)
- 3G Network
- HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
- 4G Network
- 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 - SM-G991U1
- 5G Network
- 2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G991U1
No matching specifications. Try a different word.
Specifications from the RF Safe source record. Regional variants can differ; source software details may predate later updates.
02 / REPORTED SAR
Six readings. More context.
SAR describes radiofrequency energy absorbed per unit of tissue mass under specified test conditions. These reported values are not a measurement of your everyday exposure or a safety score.
Cellular only
Cellular + Wi-Fi
Values match the rounded RF Safe dataset used in our comparison tool. Test separation and averaging details are not included in that dataset; check the original filing for your exact variant. These are phone values, not case-performance results.
03 / VISUAL EXPLORER
Take a closer look.
RF Safe’s age-based illustrations repeat the phone’s reported SAR values across age panels. The shading is illustrative; it does not measure absorption in children or predict an individual’s dose.
04 / YOUR NEXT STEP
Thoughtful design. Better habits.
Explore QuantaCase and the usage guide. Check the exact model before choosing a case—fit matters.
View this phone’s QuantaCase ↗The way you use it matters.
Get to know the flap, the orientation, and the everyday habits behind the design.
Read the usage guide →
