Samsung

Samsung G991B Galaxy S21 5G 128GB Unlocked Smartphone

4.1 (130 reviews)
8K64 MP

Samsung Galaxy S21 5G delivers flagship performance with an 8K camera, 5G connectivity, and DeX desktop mode.

$209.95*$899.99Save 76%
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*Price sourced from Amazon.com. Last updated:Jun 07, 2026.Price and availability are subject to change.

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Overview

The Samsung Galaxy S21 5G packs flagship-tier technology into a refined 6.2-inch form factor. Its Dynamic AMOLED 2X display delivers vivid color reproduction and deep blacks, protected by Corning Gorilla Glass Victus for everyday durability. The triple rear camera system — comprising a 64MP telephoto, 12MP wide-angle, and 12MP ultrawide — gives you the flexibility to capture everything from detailed close-ups to expansive landscapes, with 8K video recording for future-proof content creation. The 10MP front camera handles video calls and selfies with clarity and auto-HDR support.

Powered by Samsung's Exynos 2100 octa-core processor and 8GB of RAM, the Galaxy S21 handles multitasking, gaming, and productivity with ease. Samsung DeX capability lets you connect to an external display for a desktop computing experience, making it a genuine productivity tool beyond typical smartphone use. This unlocked model comes free of carrier-installed apps, delivering a cleaner, more customizable Android 11 experience with One UI 3.1. With 5G support, 25W fast charging, 15W wireless charging, and reverse wireless charging built in, the S21 is designed to keep up with demanding daily use while offering modern connectivity and charging flexibility.

Key Features

Pro Grade Camera: Zoom in close, take photos and videos like a pro, and capture incredible share-ready moments with our easy-to-use, multi-lens camera

Sharp 8K Video: Capture your life's best moments in head-turning, super-smooth 8K video that gives your movies that cinema-style quality

Multiple Ways to Record: Create share-ready videos and GIFs on the spot with multi-cam recording and automatic professional-style effects

30 Space Zoom: Get amazing power and clarity, zoom in from afar or magnify details of nearby objects; Zoom Lock keeps focus and stability

Higher Resolution: 64 MP camera system captures and shares detailed portraits, stunning landscapes and crisp close-ups.All Day Intelligent Battery: Intuitively manages your cellphone's usage to conserve energy, so you can go all day without charging (based on average battery life under typical usage conditions)

Specifications

Display
6.2" Dynamic AMOLED 2X, 1080 x 2400 pixels, Gorilla Glass Victus
Processor
Exynos 2100 Octa-core (1x2.9GHz Cortex-X1, 3x2.80GHz Cortex-A78, 4x2.2GHz Cortex-A55)
GPU
Mali-G78 MP14
Memory
8GB RAM
Storage
128GB
Rear Camera
Triple: 64MP + 12MP + 12MP, LED flash, auto-HDR, panorama
Front Camera
10MP, Dual video call, Auto-HDR
Operating System
Android 11, One UI 3.1
Battery
4000mAh Li-Ion, non-removable
Charging
25W fast charging, 15W Qi wireless, 4.5W reverse wireless
Network
5G
Status
Unlocked
Brand
Samsung
Model
G991B

Pros & Cons

👍 Pros

  • Triple camera system with 64MP main sensor and 8K video recording delivers versatile, high-resolution photography
  • 6.2-inch Dynamic AMOLED 2X display with Gorilla Glass Victus provides vibrant visuals and strong durability
  • Unlocked and carrier-free means no bloatware and broad network compatibility
  • Samsung DeX support extends the phone into a desktop-like productivity environment
  • 5G connectivity enables faster data speeds on supported networks

👎 Cons

  • Exynos 2100 chipset in this international variant may deliver different performance and battery life compared to the Snapdragon version
  • 4000mAh battery is modest for a flagship phone, especially with 5G enabled
  • 128GB storage with no microSD card slot limits expandable storage options
  • Plastic back panel feels less premium than glass-backed competitors at this price tier

Frequently Asked Questions

The S21 5G has a triple rear camera setup with a 64MP telephoto, 12MP wide, and 12MP ultrawide lens, plus a 10MP front-facing camera. It can capture video up to 8K resolution.
Yes, it supports 15W Qi/PMA wireless charging, 25W wired fast charging, and can even reverse wireless charge other devices at 4.5W.
This model uses the Exynos 2100 octa-core processor, which is the international variant. Note that the US market version typically uses a Snapdragon chipset.
No, this is an unlocked smartphone free from carrier bloatware and pre-loaded apps, compatible with various carrier networks.
Yes, Samsung DeX lets you connect the S21 to a monitor for a desktop-like computing experience, useful for productivity and presentations.