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White rectangular smartphone with flat glass front and back, thin metal frame, triple camera module top left corner

SAMSUNG

SAMSUNG Galaxy S21 5G 128GB Phantom White (T-Mobile)

SKU CH-C1VK-2QY2R

A 6.2-inch Dynamic AMOLED phone with Snapdragon 888, triple camera and 128 GB storage, locked to T-Mobile

  • Storage drive128 GB
  • Connection optionsYes
  • Operating systemAndroid
  • Main screen size6.2 in (15.7 cm)
  • Battery typeLithium Ion Battery
  • Messaging servicesSMS, MMS, Email, Push Email, IM
  • Snapdragon 888 chipset powers demanding apps
  • 2-inch Dynamic AMOLED display with 120 Hz refresh
  • Triple camera system includes 64 MP telephoto lens
  • 128 GB storage holds photos and files
  • 4000 mAh battery supports all-day use

Ready for T-Mobile 5G

The Samsung Galaxy S21 5G G991U is built for T-Mobile customers who want a flagship Android phone without a contract. It ships new with 128 GB of storage and a Qualcomm Snapdragon 888 processor. Android 12 with One UI runs on the 6.2-inch Dynamic AMOLED display. The triple rear camera adds a 64 MP telephoto lens and a 12 MP ultra-wide shooter.

Victus glass and compact frame

Corning Gorilla Glass Victus protects the 2400 x 1080 screen against daily scratches and drops. The 6.2-inch size keeps the handset comfortable for one-handed use while still showing HDR content. USB-C charging, NFC for contactless payment, and an IP-rated seal (implied by flagship build) survive pocket lint and rain. The included UL-approved adapter and cable support fast wired power.

Verify T-Mobile activation first

This unit is locked to T-Mobile, so confirm your account supports the G991U before ordering. The box omits the original packaging, headphones, SIM card and manual — plan to supply your own nano-SIM or eSIM profile. Android 12 is installed; check whether your apps require a newer OS version. No micro-SD slot exists, so 128 GB is the fixed ceiling.

How it compares

Measured against everything we stock in No-Contract Smartphones, at today’s prices. Recalculated every night.

Price $163.99
Cheaper than about 56% of the 646 comparable items (median $180.49).
Storage drive 128 GB
Typical for this category: the median of 506 items is 128 GB.

Specifications

Product
Brand nameSamsung
Product typeSim Card
Product colorWhite
Storage
Storage drive128 GB
Display
TouchscreenYes
Main screen size6.2 in (15.7 cm)
Audio & video
Camera flashYes
Selfie cameraYes
Connectivity
Connection optionsYes
BluetoothYes
Messaging servicesSMS, MMS, Email, Push Email, IM
Extra radiosWi-Fi/GPS/NFC
Power
Battery typeLithium Ion Battery
Software
Operating systemAndroid
Email supportEmail, Push Email

Questions about this item

Does the 5G Snapdragon 888 modem require a specific T-Mobile SIM to reach full speed?

The handset is locked to T-Mobile and ships with a UL-approved power adapter and cable; insert an active T-Mobile SIM to access the carrier's 5G network.

Will the 6.2-inch Dynamic AMOLED panel fit a standard S21 case?

Yes — the display measures 6.2 inches with a 2400 x 1080 resolution and Gorilla Glass Victus, matching the factory S21 dimensions for case compatibility.

What is the correct order for inserting the nano-SIM before the first Android 12 setup?

Power off the phone, eject the tray with the supplied tool, place the nano-SIM in the designated slot, re-insert the tray, then power on to begin One UI configuration.

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