5G Dynamic AM-OLED IP68 Smartphone

Samsung SM-G998U Galaxy S21 Ultra 5G UW Dual SIM TD-LTE US 256GB / SM-G998T (Samsung Unbound O3)

Samsung · Announced Jan 2021

About Samsung Galaxy S21 Ultra 5G

The Samsung Galaxy S21 Ultra 5G presents a striking 6.81‑inch color AM‑OLED screen that delivers a sharp 1440 by 3200 pixel resolution, offering vivid colors and deep contrast for media and everyday use. Its sleek form measures 75.6 mm wide, 165.1 mm tall and 8.9 mm thick, with a weight of 227 grams, making it a substantial yet manageable flagship that fits comfortably in the hand despite its large display.

Inside, the phone runs Google Android 11 and is equipped with 16 GiB of RAM, providing ample memory for multitasking and demanding applications. Power comes from a 5000 mAh battery that supports wired charging at up to 15 watts, while a single SIM slot keeps connectivity straightforward. These core specifications define the device’s performance and endurance without venturing into unconfirmed territory.

This variant

The SM‑G998U model steps down the RAM to 12 GiB compared with the base Galaxy S21 Ultra’s 16 GiB, and it ships with a fixed 256 GB of internal storage—a capacity not detailed in the base description. As the US‑specific iteration, it carries the UW (Ultra Wideband) and TD‑LTE labels and is tied to the T‑Mobile network (SM‑G998T suffix), while retaining the same single‑SIM slot found in the base model.

Compared with other S21 Ultra variants, this US‑locked T‑Mobile version differs from the Verizon (V), AT&T (A), unlocked (U1), and carrier‑free international models that share the same SM‑G998U prefix but offer alternative storage options (128 GB or 512 GB) or higher RAM configurations (16 GiB). Many overseas versions also provide dual‑SIM capability, whereas this US model maintains a single SIM slot, aligning it with the base device’s connectivity approach.

Technical Specifications

Display

Size

6.81 inch

Type

Dynamic AM-OLED

Resolution

1440x3200

Color depth

24-bit, 10-bit HDR

Panel

Samsung

Screen-to-body

89.7%

Active area

70.99 × 157.76 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

12 GiB

Battery

Capacity

5000 mAh

Type

Lithium-ion

Energy

19.4 Wh

Voltage

3.88 V

Charging

15W

Cameras

Main

12000×9000 · 10× optical visibility

Ultrawide

13 mm visibility

Telephoto

70 mm visibility

Telephoto

240 mm visibility

Front

7296×5472 visibility

Dimensions

Size

75.6 × 165.1 × 8.9 mm

Weight

227 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

NR · 1 bandsTD-NR · 3 bandsLTE · 17 bandsTD-LTE · 6 bandsUMTS · 5 bandsGSM · 4 bands

All NR bands (1)

NR 600 MHz (N71)

All TD-NR bands (3)

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

All LTE bands (17)

LTE 1700/2100 MHz (Band 4, AWS)
LTE 1700/2100 MHz (Band 66)
LTE 1800 MHz (Band 3)
LTE 1900 MHz (Band 2, PCS)
LTE 1900 MHz (Band 25)
LTE 2100 MHz (Band 1)
LTE 2600 MHz (Band 7)
LTE 600 MHz (Band 71)
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 26)
LTE 850 MHz (Band 5)
LTE 900 MHz (Band 8)

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

DAC

32-bit / 384 kHz

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

e-SIM (embedded) · Dual standby

Carrier

T-Mobile USA

Markets

North America (NA) (USA)

Extras

Haptic touch feedback, Active stylus

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

Final

Samsung SM-G998W Galaxy S21 Ultra 5G Dual SIM TD-LTE CA 512GB (Samsung Unbound O3)

View Specs

Live Contract Deals

Placeholder

Deals integration coming soon