Quick overview
The Samsung Galaxy S21 is Samsung’s compact 2021 flagship that balances high-end performance with a smaller, more pocketable body. It ships with Android 11 and One UI 3.1 and comes in two processor variants (Exynos 2100 or Qualcomm Snapdragon 888), 8GB of RAM, and 128GB or 256GB of built-in storage. The phone pairs a 6.2-inch FHD+ Dynamic AMOLED 2X display (up to 120Hz) with a 4,000 mAh battery and a versatile triple rear camera setup.
Key specifications at a glance
- Display: 6.2-inch FHD+ Dynamic AMOLED 2X, 120Hz adaptive refresh
- Operating system: Android 11 with One UI 3.1 (at launch)
- Chipset: Exynos 2100 (international) or Snapdragon 888 (select regions)
- Memory: 8GB RAM; Storage: 128GB / 256GB (no microSD expansion)
- Cameras: Triple rear (wide, ultrawide, 64MP telephoto sensor used for hybrid zoom); 10MP front camera
- Battery: 4,000 mAh with wired and wireless charging support
- Build: Aluminum frame with a glossy or matte “Glasstic” back depending on finish
Design and display
The S21 adopts a sleeker camera housing that visually blends into the aluminum frame, giving the rear camera array a more integrated look. Samsung used a hard plastic back (marketed as “Glasstic”) on the S21 rather than glass to keep weight and cost down; many buyers like the feel and lighter weight, though some prefer glass for a more premium tactile impression.
The 6.2-inch Dynamic AMOLED 2X offers vivid colors, deep blacks, and a smooth 120Hz refresh rate. The default resolution is FHD+, which helps battery life compared with higher-resolution modes; the adaptive refresh makes animations and scrolling feel fluid without always running at the maximum rate.
Performance and battery
Depending on region, the S21 uses either Samsung’s Exynos 2100 or Qualcomm’s Snapdragon 888. Both are flagship-class chipsets for their generation and handle everyday tasks, gaming, and multitasking well when paired with 8GB of RAM. Storage is fixed to the internal 128GB or 256GB options; there’s no microSD slot.
The 4,000 mAh battery is sized to match the compact display and efficient hardware; combined with adaptive refresh and power management, it typically delivers a full day of mixed use for most people. The phone supports wired fast charging and wireless charging, plus wireless power sharing to top up compatible accessories.
Camera system — what it does best
The S21’s camera setup is designed for versatility: a wide main sensor, an ultrawide, and a higher-resolution telephoto sensor that the phone uses for zoom and hybrid zoom modes. In daylight the system captures detailed, well-processed images with vivid colors. The telephoto element offers practical zoom without switching to a separate periscope lens, and the ultrawide is handy for landscapes and group shots.
On the software side, Samsung includes Night Mode, Single Take, portrait effects, and a range of video features. The 10MP front camera is capable of clean selfies and video calls. As with most phones, low-light performance improves with Night Mode, and moving subjects benefit from the camera’s autofocus and tracking options.
Software and useful features
At launch the S21 ran Android 11 with Samsung’s One UI 3.1 skin. One UI focuses on one-handed usability and adds features like device continuity across Samsung products, edge panels, and a wide variety of customization options. The S21 supports S Pen input via accessories, although it doesn’t include a built-in S Pen slot (that feature is reserved for Samsung’s Ultra models).
Other handy features include Samsung’s adaptive display settings (Motion Smoothness), call-and-text on other devices when signed into the same Samsung account, and wireless power sharing for compatible earbuds and peripherals.
Pros and cons — quick checklist
Pros
- Compact, comfortable size for a flagship-class device
- High-refresh AMOLED display with great color and smooth scrolling
- Strong real-world performance from flagship chipsets
- Versatile camera system covering wide, ultrawide and zoom
- Wireless charging and wireless power sharing supported
Cons
- No microSD slot — storage is fixed
- Plastic (Glasstic) back instead of glass may feel less premium to some buyers
- S Pen compatibility requires an accessory and lacks a built-in silo
Who should consider the Galaxy S21?
The S21 is a good fit if you want a true flagship experience in a smaller, easier-to-handle phone. It’s suited for users who prioritize a bright, fast display, solid cameras for everyday shooting, and flagship-level performance without the larger footprint of a Plus or Ultra model. If expandable storage or a built-in S Pen slot are must-haves, consider other models in Samsung’s lineup.
Samsung is one of the global leaders among smartphone manufacturers; if you’re comparing brands and models, you may find it useful to read broader market guides that place Samsung alongside other top vendors and their strengths.
Frequently asked questions
Does the Galaxy S21 support a stylus?
Yes — the S21 supports S Pen input through compatible accessories, but it doesn’t have an integrated S Pen slot. If stylus use is central to your workflow, the Ultra models offer a built-in solution.
Can I expand storage on the S21?
No. The S21 does not include a microSD card slot; choose a storage tier at purchase or rely on cloud storage for extra space.
Final verdict
The Samsung Galaxy S21 remains a compelling compact flagship: strong performance, a beautiful 120Hz AMOLED screen, and a flexible camera system make it a solid choice for most users. Its compromises — fixed storage and a plastic back — are trade-offs for lower weight and a more accessible price point compared with larger flagship siblings. Evaluate how important storage expansion and a built-in stylus slot are to you, and the S21 can still be a very practical, well-rounded phone.
