Head exposure reference
Samsung · PHONE PROFILE
Samsung Galaxy S21
The specifications, radiation measurements and practical choices for your phone.
Display6.2 inches
ChipsetExynos 2100 (5 nm) - InternationalQualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China
FCC identifierA3LSMG991U
RF Safe source record retrieved September 12, 2026. Regional specifications and test configurations may differ.
The SAR overview.
Reported US test values · W/kg averaged over 1 g of tissue
Head SAR · cellular only0.74 W/kg46% of US localized limit
Body SAR · cellular only1.08 W/kg68% of US localized limit
Hotspot SAR · cellular only1.11 W/kg69% of US localized limit
Head SAR · simultaneous1.45 W/kg91% of US localized limit
Body SAR · simultaneous1.54 W/kg96% of US localized limit
Hotspot SAR · simultaneous1.58 W/kg99% of US localized limit
0–0.400.41–0.800.81–1.201.21+ W/kgUS localized test values · 1 g average
Colors indicate reported SAR ranges, not a safety verdict. Results depend on test configuration and regional model. A lower listed maximum does not guarantee lower everyday exposure. How to read these numbers →
Additional SAR values & source information
| Hotspot, cellular only (US) | 1.11 W/kg |
|---|---|
| Product-specific source field (US) | 1.11 W/kg |
| Head (EU, 10 g) | 0.46 W/kg |
| Body (EU, 10 g) | 1.51 W/kg |
| FCC ID | A3LSMG991U — FCC equipment search ↗ |
| Source | RF Safe original phone profile ↗ |
| Data note | Values are reported by the RF Safe source record and have not been independently re-tested here. Zero or blank source values are shown as not listed. |
Your SAR comparison, at a glance.
Cellular-only and simultaneous-transmission values, side by side.
RF Safe source chart. Green and red compare lower and higher values within this chart; they differ from the fixed SAR ranges above. Percentage differences compare test configurations and do not predict a personal exposure reduction.
Two views. One clearer picture.
RF Safe reference illustrations for this phone.
Body exposure reference
Source illustrations visualize the RF Safe record. They are not scans of an individual, a measured personal dose, or a forecast of disease. Read the numerical labels and the original test context.
A practical introduction.Read the illustrated usage guide →
BETTER PHONE HABITS
Put the numbers into practice.
Watch the phone safety introduction, then explore the illustrated guide to distance, carrying and correct QuantaCase orientation.
Explore the usage guide →Every specification, in one place.
Source specifications by category. Regional models, software and availability may differ.
General
| Phone | Samsung Galaxy S21 |
|---|---|
| Technology | GSM / CDMA / HSPA / EVDO / LTE / 5G |
| Announced | 2021-01-14 22:28:09 |
| Availability (source snapshot) | Available. Released 2021, January 29 |
| Price (historical source) | $ 473.00 / € 702.88 / £ 559.90 / ₹ 59,879 |
| 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 |
| Display Test | Contrast ratio: Infinite (nominal) |
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 |
|---|---|
| Battery Test | Endurance rating 93h |
| Charging | Fast charging 25W USB Power Delivery 3.0 Fast Qi/PMA wireless charging 15W Reverse wireless charging 4.5W |
Hardware
| Operating system (source snapshot) | 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 |
| Performance | AnTuTu: 584055 (v8) GeekBench: 3238 (v5.1) GFXBench: 60fps (ES 3.1 onscreen) |
| 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 |
| Loudspeaker Test | -26.4 LUFS (Good) |
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 |
Find the case for your phone.
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Samsung S21 RFS1 Anti-Radiation Case
Available · 1 option
$33.99Choose options ↗
QuantaCase is a directional shielding accessory and a habit-training tool. Correct orientation matters; a case does not make a phone risk-free. Explore the design →
Know the phone. Learn the habits.
A visual guide to distance, speakerphone, carrying and correct case orientation.
Keep exploring.
Other Samsung models with nearby reported head SAR values.
SamsungUS · 1 g
Galaxy A73
Head SAR0.74 W/kg
Body SAR0.52 W/kg
SamsungUS · 1 g
Galaxy A26
Head SAR0.75 W/kg
Body SAR1.19 W/kg
SamsungUS · 1 g
Galaxy A34
Head SAR0.75 W/kg
Body SAR0.76 W/kg
SamsungUS · 1 g
Galaxy S23
Head SAR0.75 W/kg
Body SAR0.70 W/kg