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Rectangular black smartphone with large touchscreen and rear camera array

SAMSUNG

SAMSUNG Galaxy S21 Ultra 5G G998U T-Mobile 128GB Phantom Black

SKU CH-7VF3-282T4

A 6.8-inch Android smartphone with a 108MP camera, 12GB RAM and 128GB storage, powered by a Snapdragon 888 processor and a 5000mAh battery

  • TypeCell Phone
  • Form FactorTouch Screen Phones
  • ColorBlack
  • Touch ScreenYes
  • Main Display Size6.8"
  • Operating SystemAndroid
  • Snap 888 12 GB RAM powers demanding tasks
  • 108 MP sensor captures 33 MP stills from 8K video
  • 8" Dynamic AMOLED 3200 x 1400 adapts 10 Hz to 120 Hz
  • 5000 mAh battery fuels the large high-res display
  • Gorilla Glass Victus protects the 6.8" screen

Samsung Galaxy S21 Ultra 5G G998U T-Mobile 128GB

This unlocked smartphone is built for users who need flagship camera capabilities and a large display on the T-Mobile network. It delivers a 108MP main sensor and 8K video recording in a 6.8 inch Dynamic AMOLED panel. The 12GB of RAM and Snapdragon 888 processor handle multitasking and demanding apps. It suits photographers and power users who want maximum versatility in a single device.

Thermals noise and power draw

The 5000mAh battery powers the 120Hz adaptive display and high-performance processor through typical daily workloads. The adaptive refresh rate scales between 10Hz and 120Hz to conserve energy during static content. Efficient thermal management sustains performance during extended camera sessions or gaming. The included UL approved power adapter supports fast recharging when needed.

Carrier lock constraint

This G998U model is locked to the T-Mobile network and will not operate on other carriers without unlocking. Buyers who need multi-carrier flexibility or international roaming on different networks should consider an unlocked variant. The 128GB storage capacity is fixed with no expansion slot for additional media.

Highlights

  • Snap 888 12 GB RAM powers demanding tasks
  • 108 MP sensor captures 33 MP stills from 8K video
  • 8" Dynamic AMOLED 3200 x 1400 adapts 10 Hz to 120 Hz
  • 5000 mAh battery fuels the large high-res display
  • Gorilla Glass Victus protects the 6.8" screen

Specifications

BrandSamsung
SeriesGalaxy S21 Ultra 5G
ModelG998U
TypeCell Phone
Form FactorTouch Screen Phones
ColorBlack
Touch ScreenYes
Main Display Size6.8"
Operating SystemAndroid
RAM12GB
Storage128GB
GPS IntegratedYes

Questions about this item

How do I insert the nano-SIM into the G998U?

Use the supplied ejection tool on the lower-edge tray hole, pull the tray out, seat the nano-SIM with contacts facing down, and slide the tray back until it clicks.

Which component of the Galaxy S21 Ultra 5G will need replacement first under normal use?

The 5000 mAh battery is the part most likely to require replacement after several hundred charge cycles.

What limit appears first during sustained heavy use of the Snapdragon 888 SM8350?

Thermal throttling reduces clock speeds once the vapor-chamber cooling saturates during prolonged 8K recording or gaming.

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