5G Dynamic AM-OLED Smartphone

Samsung SM-F721U Galaxy Z Flip 4 5G UW TD-LTE US 128GB / SM-F721R4 (Samsung B4)

Samsung · Announced Aug 2022

About Samsung Galaxy Z Flip 4

The Samsung Galaxy Z Flip 4 folds into a pocket‑friendly slab measuring 71.9 by 165.2 by 6.9 millimetres and weighing just 187 grams, making it easy to carry while still offering a usable exterior screen. When closed, the device reveals a 1.9‑inch colour AM‑OLED panel with a resolution of 512 by 260 pixels, providing quick glances at notifications, time and other essentials without needing to open the phone.

Inside, the phone runs on Android 5.10.81 and is equipped with 8 gigabytes of RAM for smooth multitasking. Power comes from a 3 700 milliampere‑hour battery that supports wired charging at up to 15 watts, and the handset accommodates a single SIM card for cellular connectivity. These specifications combine to give the Galaxy Z Flip 4 a compact form factor paired with the performance needed for everyday use.

This variant

This US‑specific model is identified as SM‑F721R4 and supports UW TD‑LTE networks, coming with 128 GB of internal storage. It differs from the Japanese, Korean, Canadian and China/Hong Kong/Taiwan variants that carry different model numbers and regional LTE bands, and it lacks the special‑edition branding found on the Maison Margiela and Bespoke editions. Compared with the other US‑listed versions, it stands apart from the SM‑F721V and SM‑F721T models by its model number and from the 256 GB US variant by its storage capacity.

Technical Specifications

Display

Size

1.9 inch

Type

Dynamic AM-OLED

Resolution

512x260

Color depth

24-bit, 10-bit HDR

Panel

Samsung

Screen-to-body

85.6%

Active area

64.48 × 157.62 mm

Touch

Capacitive multi-touch sensing screen, 10-point

Punch-hole

Yes

Performance

Processor

Snapdragon 8+ Gen 1 5G

CPU

Octa-core, up to 3.2 GHz

GPU

Qualcomm Adreno 730

Process

4 nm

Platform

Google Android

Kernel

5.10.81

Memory

RAM

8 GiB

Battery

Capacity

3700 mAh

Type

Lithium-ion

Energy

14.36 Wh

Voltage

3.88 V

Cells

2 cells in parallel

Charging

15W

Cameras

Main

4000×3000 · 1× optical visibility

Main

visibility

Front

3648×2736 visibility

Dimensions

Size

71.9 × 165.2 × 6.9 mm

Weight

187 g

Connectivity

Wi-Fi

Wi-Fi 6

Wi-Fi services

DLNA, Miracast, Wi-Fi Direct, Wi-Fi Tethering, 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

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

NFC

NFC A, NFC B

GPS

GPS, GLONASS, Galileo, BeiDou, QZSS

GPS services

Simultaneous GPS (S-GPS), Assisted GPS, Geotagging, QuickGPS, QZSS

NR · 5 bandsTD-NR · 3 bandsLTE · 11 bandsTD-LTE · 6 bandsUMTS · 5 bandsGSM · 4 bands

All NR bands (5)

NR 1700/2100 MHz (N66)
NR 1900 MHz (N2, PCS)
NR 1900 MHz (N25)
NR 600 MHz (N71)
NR 850 MHz (N5)

All TD-NR bands (3)

TD-NR 2500 MHz (N41)
TD-NR 28 GHz (N261) bands
TD-NR 39 GHz (N260)

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)

Audio

Channels

stereo

Output

USB Type-C

Sensors

Accelerometer, Barometer, Compass, Fingerprint sensor, Gyroscope, Hall sensor, Light intensity sensor, Proximity sensor

Features

Fingerprint

Yes (fingerprint sensor)

SIM

e-SIM (embedded), Nano-SIM (4FF)

Carrier

United States Cellular Corporation

Markets

North America (NA) (USA)

Extras

Haptic touch feedback, Foldable screen

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