Head exposure reference
Samsung · PHONE PROFILE
Samsung Galaxy Z Flip4
The specifications, radiation measurements and practical choices for your phone.
Display6.7 inches
ChipsetQualcomm SM8475 Snapdragon 8+ Gen 1 (4 nm)
FCC identifierA3LSMF721U
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 only0.19 W/kg12% of US localized limit
Body SAR · cellular only0.77 W/kg48% of US localized limit
Hotspot SAR · cellular only1.01 W/kg63% of US localized limit
Head SAR · simultaneous1.56 W/kg98% of US localized limit
Body SAR · simultaneous1.16 W/kg72% of US localized limit
Hotspot SAR · simultaneous1.59 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) | 1.01 W/kg |
|---|---|
| Product-specific source field (US) | 1.01 W/kg |
| Head (EU, 10 g) | 1.15 W/kg |
| Body (EU, 10 g) | 1.20 W/kg |
| FCC ID | A3LSMF721U — 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 Z Flip4 |
|---|---|
| Technology | GSM / CDMA / HSPA / EVDO / LTE / 5G |
| Announced | August 10, 2022 |
| Availability (source snapshot) | Available. Released 2022, August 25 |
| Price (historical source) | C$ 1,100.00 / ₹ 71,850 / $ 564.00 / £ 799.99 / € 789.90 |
| Model Names | SM-F721B, SM-F721B/DS, SM-F721N, SM-F721U, SM-F721U1, SM-F721W |
Display
| Type | Foldable Dynamic AMOLED 2X, 120Hz, HDR10+, 1200 nits (peak) |
|---|---|
| Size | 6.7 inches, 101.5 cm2 (~85.4% screen-to-body ratio) |
| Resolution | 1080 x 2640 pixels (~426 ppi density) |
| Features | N/A |
| Display Test | Contrast ratio: Infinite (nominal) |
Camera
| Main Camera | Dual Camera: 12 MP, f/1.8, 24mm (wide), 1/1.76", 1.8m, Dual Pixel PDAF, OIS 12 MP, f/2.2, 123 (ultrawide), 1.12m |
|---|---|
| Main Features | LED flash, HDR, panorama |
| Video | 4K@30/60fps, 1080p@60/240fps, 720p@960fps, HDR10+ |
| Selfie Camera | Single Camera: 10 MP, f/2.4, 26mm (wide), 1.22m |
| Selfie Camera Features | HDR |
| Selfie Camera Video | 4K@30fps |
Battery
| Type | Li-Po 3700 mAh, non-removable |
|---|---|
| Charging | 25W wired, 50% in 30 min (advertised) 15W wireless 4.5W reverse wireless |
Hardware
| Operating system (source snapshot) | Android 12, upgradable to Android 13, One UI 5 |
|---|---|
| Chipset | Qualcomm SM8475 Snapdragon 8+ Gen 1 (4 nm) |
| CPU | Octa-core (1x3.19 GHz Cortex-X2 & 3x2.75 GHz Cortex-A710 & 4x1.80 GHz Cortex-A510) |
| GPU | Adreno 730 |
| Performance | AnTuTu: 685754 (v8) | 800001 (v9) GeekBench: 3913 (v5.1) GFXBench: 74fps (ES 3.1 onscreen) |
| Internal Storage | 128GB 8GB RAM, 256GB 8GB RAM, 512GB 8GB RAM |
| Card Slot | No |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass, barometer |
Connectivity
| Wi-fi | Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct |
|---|---|
| Bluetooth | 5.2, A2DP, LE |
| USB | USB Type-C 2.0, USB On-The-Go |
| GPS | GPS, GLONASS, GALILEO, BDS |
| NFC | Yes |
| Radio | No |
Sound
| Loudspeaker | Yes, with stereo speakers |
|---|---|
| 3.5mm Jack | No |
| Loudspeaker Test | -27.5 LUFS (Good) |
Design
| Type | Bar |
|---|---|
| Dimensions | Unfolded: 165.2 x 71.9 x 6.9 mm Folded: 84.9 x 71.9 x 15.9-17.1 mm |
| Weight | 187 g (6.60 oz) |
| Colors | Bora Purple, Graphite, Pink Gold, Blue, Yellow, White, Navy, Khaki, Red |
| Build | Plastic front (opened), glass back (Gorilla Glass Victus+), aluminum frame |
Network
| Speed | HSPA, LTE-A (6CA), 5G |
|---|---|
| SIM | Nano-SIM and eSIM |
| 2G Network | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 |
| 4G Network | LTE |
| 5G Network | SA/NSA/Sub6/mmWave |
Find the case for your phone.
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No exact case match listed
Browse QuantaCase for current model availability. A similar model name does not establish fit.
Check the catalog →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 →
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A visual guide to distance, speakerphone, carrying and correct case orientation.
Keep exploring.
Other Samsung models with nearby reported head SAR values.
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Galaxy A70
Head SAR0.26 W/kg
Body SAR0.25 W/kg
SamsungUS · 1 g
Galaxy S10 5G
Head SAR0.30 W/kg
Body SAR1.11 W/kg
SamsungUS · 1 g
Galaxy A50
Head SAR0.34 W/kg
Body SAR0.45 W/kg
SamsungUS · 1 g
Galaxy S9
Head SAR0.35 W/kg
Body SAR0.96 W/kg