Last Updated & Fact Checked: April 18, 2026
Are you trying to decide between the Samsung Galaxy A21 and the Samsung Galaxy S21 Ultra?
Product Versus will provide you with all the product details so you can quickly compare the facts to find which product is right for you – the Samsung Galaxy A21 or the Samsung Galaxy S21 Ultra – and find out exactly what the differences are.
Both the Samsung Galaxy A21 and the Samsung Galaxy S21 Ultra are quality products, so read on to find out which one is best for your needs!
Samsung Galaxy A21 quick facts
Samsung Galaxy S21 Ultra quick facts
Samsung Galaxy A21 product details
Bestseller No. 1
Samsung Galaxy A21 GSM Unlocked Android Cell Phone, US Version Smartphone, 32GB Storage, Long-Lasting Battery, 6.5” Infinity Display, Quad Camera, Black (Renewed)
- Amazon Renewed Condition: May has few minor scuffs or scratched, NO cosmetic damages on it, the item may have signs of handling such as minor scratches or minor marks.
- This device is GSM unlocked and will work with T-Mobile, Sprint, AT&T, Not compatible with Cricket and any other CDMA network. To ensure this phone will work with your carrier please check to make sure the frequencies your carrier uses are supported by this phone.
- Clean IMEI. Ships in non-original box with premium aftermarket charger and USB cable. NO any other accessory!
Bestseller No. 2
Samsung Galaxy A21 32GB 6.5 inches Quad Camera A215 GSM Unlocked Black Single SIM (Renewed)
- This device is GSM unlocked and will work with all major Canadian carriers. Not compatible with, Any CDMA network like Sprint, Verizon, Virgin Mobile US or Boost, USCellular. Network bands in regions may be different depending on the mobile operator and your location. Available storage is less and subject to change due to device software updates and apps usage.
- Camera description, Front
- Operating system, android
- Package Weight, 1.0 pounds
Bestseller No. 3
SAMSUNG Galaxy A21 LTE Verizon | 6.5" Screen | 32GB of Storage | Long Lasting Battery | Single SIM | 2020 Model | US Version | Black - (SM-A215UZKAVZW) (Renewed)
- CHARGE UP. POWER THROUGH: Spend more time scrolling, texting and sharing, and less time looking for an outlet to charge. This long-lasting battery has the power to keep up with you.
- BIG SCREEN TO GET MORE DONE: Keep in touch with friends, family and the news with plenty of room on a crystal clear 6.5" edge-to-edge display.
- A LENS FOR YOUR FAVORITE ANGLE: Capture shareable portraits, wide shots and videos with this versatile triple lens camera.
- STORE MORE: Keep all your photos and apps without worrying about storage. And get up to 512GB of storage with a microSD card.
- Operating system: Android
Samsung Galaxy S21 Ultra product details
Bestseller No. 1
Samsung Galaxy S21 Ultra 5G, US Version, 128GB, Phantom Black - Unlocked (Renewed)
- The Samsung Galaxy S21 Ultra (Renewed) is a premium smartphone with a 6.8-inch AMOLED display, 120Hz refresh rate, and powerful camera system featuring a 108MP main lens and up to 100x zoom. It supports the S Pen, offers strong performance with 5G connectivity, and is ideal for users seeking flagship features at a better value.
Bestseller No. 2
Samsung Galaxy S21 Ultra 5G, US Version, 256GB, Phantom Black - Unlocked (Renewed)
- The Galaxy S21 Ultra features a massive 6.8-inch Dynamic AMOLED 2X display with Quad HD+ resolution, HDR10+ support, and an adaptive 120Hz refresh rate that scales dynamically to deliver ultra-smooth visuals while conserving battery life.
- Its rear camera system is a powerhouse, combining a 108MP wide sensor, 12MP ultra-wide lens, and two telephoto lenses (10MP each) with 3x and 10x optical zoom. With up to 100x Space Zoom, advanced AI scene optimization, and laser autofocus, the S21 Ultra captures extraordinary detail, whether shooting landscapes, zoomed-in subjects, or 8K video content.
- The phone is powered by Snapdragon 888 (U.S.) or Exynos 2100 (global) paired with up to 16GB of RAM, making it exceptionally fast for gaming, multitasking, and demanding productivity apps. Coupled with Samsung DeX support, the Ultra can be used like a full desktop workstation for editing, presentations, and professional workflows.
- The Galaxy S21 Ultra offers a 5,000 mAh intelligent adaptive battery with fast wired charging, fast wireless charging, and reverse wireless charging. Its AI-driven battery management optimizes power use based on your habits, allowing longer usage without frequent recharging—even with heavy multitasking or 5G connectivity.
- Security and connectivity are top-tier, featuring Samsung Knox Vault for advanced protection of sensitive data, ultrasonic in-display fingerprint scanning, facial recognition, and ultra-fast 5G and Wi-Fi 6E support. Enhanced stereo speakers with Dolby Atmos create immersive audio, making the device ideal for gaming, streaming, and professional multimedia experiences.
Bestseller No. 3
Samsung Electronics Samsung Galaxy S21 Ultra 5G | Factory Unlocked Android Cell Phone | US Version 5G Smartphone | Pro-Grade Camera, 108MP High Res | 128GB, Black (SM-G998UZKAXAA) (Renewed)
- Item Package Dimension- 6.9299999929314L X 5.6299999942574W X 1.3399999986332H Inches
- Item Package Weight - 0.78925489796 Pounds
- Item Package Quantity - 1
- Product Type - Cellular Phone
New products & alternatives to the Samsung Galaxy A21 and the Samsung Galaxy S21 Ultra
New
Samsung Galaxy A16 5G SM-A166U | 128GB | AT&T Locked |Android Smartphone, Large AMOLED Display, Durable Design, Expandable Storage, US Version | Blue Black (Renewed)
- Fast speeds and seamless video calls
- All-day power with efficient energy use
- Sharp, vibrant photos with enhanced detail
- Smooth app usage and plenty of space for media
- Clear visuals for streaming, gaming, and browsing
New
Samsung Galaxy A16 5G A Series Cell Phone, Unlocked Android Smartphone, Large AMOLED Display, Durable Design, Super Fast Charging, Expandable Storage, US Version, 2025, Blue Black (Renewed)
- Charger NOT Included, 6.7" Super AMOLED FHD+, 90Hz Refresh Rate, 385 ppi, 800 nits (HBM), 1080x2340px, 5000mAh Battery
- 128GB, 4GB RAM, microSDXC, Exynos 1330 (5nm), Octa-Core, Mali-G68 MP2 or Mali-G57 MC2 GPU
- Rear Camera: 50MP, f/1.8 (wide) + 5MP, f/2.2 (ultrawide) + 2MP, f/2.4 (macro), LED flash, panorama, HDR; Front Camera: 13MP, f/2.0, Android 14, up to 6 major Android upgrades, One UI 6.1
- 3G: HSDPA 850/900/1700(AWS)/1900/2100; 4G LTE: 1/2/3/4/5/7/12/13/14/20/25/26/28/29/30/38/39/40/41/48/66/71, 5G: 2/5/25/41/66/71/77/78 SA/NSA/Sub6/mmWave - Nano-SIM + eSIM
- US Model – Global Connectivity – Compatible with Most GSM Carriers like T-Mobile, AT&T, MetroPCS, etc. Will Also work with CDMA Carriers Such as Verizon, Straight Talk.
New
Samsung Galaxy A36 5G A Series, 128GB Unlocked Android Smartphone, AMOLED Display, Rugged Design, 5G Connectivity, Affordable Performance, US Version, 2025, US 1 Yr Warranty, Awesome Lavender
- AFFORDABLY AWESOME AND ALWAYS RELIABLE: Galaxy A36 5G offers premium features and smart extras designed to elevate your everyday life — all at a price that brings exceptional value.
- AWESOME SCREEN, ENDLESS POSSIBILITIES: Elevate your content no matter where you are with the 6.7” display of Galaxy A36.¹ Whether you're gaming, streaming or browsing, enjoy massive detail and stunning clarity.
- FIND AWESOME FAST: What’s your favorite influencer wearing? Where’d they go on vacation? What’s that word mean? Don’t try to describe it — use Circle to Search with Google and get the answer in a snap.² With Galaxy A36 5G, simply circle it on your screen.
- PRO SHOTS, NO PROBLEM: From family photos to dinner with friends, the enhanced front-facing camera on Galaxy A36 5G makes every selfie look like it came straight from a photo shoot.
- SEE FAMILY MOMENTS IN A WHOLE NEW LIGHT: Your family’s special moments just got brighter with Galaxy A36 5G. With effortless Nightography, you can capture clear, high-quality photos and videos automatically without adjusting manual settings.
Our conclusion on the Samsung Galaxy A21 vs Samsung Galaxy S21 Ultra
Both the Samsung Galaxy A21 and the Samsung Galaxy S21 Ultra are high quality products and we are sure you will be happy with either one. In the end it comes down to your budget and the value for money you are looking for.
Either way, the Samsung Galaxy A21 and the Samsung Galaxy S21 Ultra are both excellent products that will more than do their job!