Galaxy S21 Ultra to Buy – Best Deals and Prices 2025
The Samsung Galaxy S21 Ultra remains a compelling option for budget-conscious consumers seeking flagship features in 2025. Originally released in January 2021, this device once commanded premium prices exceeding $1,200. Today, refurbished units sell for under $250, positioning the phone as an accessible entry point to high-end mobile photography and 5G connectivity.
However, the value proposition has shifted dramatically. Samsung removed the S21 Ultra from its One UI 8 update roadmap, effectively ending major software support. This creates a pivotal decision point for shoppers weighing immediate savings against long-term security and performance.
Is the Galaxy S21 Ultra Still Worth Buying in 2024?
108MP camera system, integrated S Pen support, 5000mAh battery capacity
No longer receives Android updates, processor aging against 2025 standards, no new stock available
$226–$370 for refurbished and used models depending on condition and storage
Budget-focused users prioritizing camera capabilities over long-term software support
Samsung has formally discontinued software support for the Galaxy S21 Ultra. The device will not receive Android 16 or subsequent security patches, potentially exposing users to unpatched vulnerabilities.
- Software support discontinued: Samsung excluded the S21 Ultra from One UI 8 (Android 16) development, halting feature updates and monthly security patches.
- Superior alternatives emerge: The Galaxy S22 Ultra frequently sells for comparable prices during promotions while offering better performance and longer support cycles.
- Refurbished market saturation: Certified used units start at $226.95, creating accessible entry points for flagship hardware.
- Trade-in depreciation: Samsung offers approximately $131 for S21 Ultra trade-ins toward the S25 Ultra, significantly less than no-trade-in promotional discounts.
- Hardware longevity: The 108MP camera system and 5000mAh battery remain competitive against mid-range 2025 devices.
- Security vulnerabilities: Absence of ongoing patches presents risks for users handling sensitive data or payment information.
| Feature | Specification |
|---|---|
| Release Date | January 2021 |
| Display | 6.8-inch Dynamic AMOLED 2X, 120Hz |
| Processor | Snapdragon 888 / Exynos 2100 |
| RAM/Storage | 12-16GB / 128-512GB |
| Battery | 5000mAh |
| Current Support | Android 14 final, no Android 16 |
Where to Buy the Galaxy S21 Ultra and Current Prices
Current Market Pricing
Certified refurbished units now start at $226.95 for 128GB models through Back Market, while Best Buy lists refurbished excellent condition units at $234.99. Pre-owned excellent condition inventory reaches $339.99 at the same retailer. Walmart offers a broader spectrum ranging from $240 to $370 depending on storage configuration and cosmetic condition.
Retailer Comparison and Inventory
UpTrade positions certified used models starting at $250, emphasizing condition verification. The Back Market ecosystem provides the lowest entry point at $226.95, though inventory fluctuates based on trade-in volumes. All major retailers currently stock factory-unlocked variants alongside carrier-specific models.
Listed prices reflect USD valuations. For Canadian buyers, consult the current USD to CAD exchange rate to calculate accurate total costs including potential import fees.
Trade-In Program Analysis
Samsung’s current trade-in structure offers limited financial incentive. SamMobile reports that trading an S21 Ultra toward a Galaxy S25 Ultra yields approximately $131 in credit. By contrast, Samsung’s limited-time promotions without trade-in requirements can save buyers up to $450, rendering the trade-in route economically disadvantageous.
Galaxy S21 Ultra Key Specs and Performance Review
Display Technology and S Pen Integration
The 6.8-inch Dynamic AMOLED 2X panel maintains flagship caliber with 120Hz adaptive refresh rates and 3200×1440 resolution. Unlike subsequent Ultra models, the S21 Ultra requires separate S Pen purchase, though the device supports stylus input through dedicated digitizer hardware.
Camera System Architecture
Samsung’s 108MP primary sensor continues to deliver detailed photography through pixel-binning technology, accompanied by two telephoto lenses providing 3x and 10x optical zoom capabilities. Technical specifications confirm 8K video recording and laser autofocus systems that remain competitive with 2025 mid-range devices.
Battery Capacity and Charging
The 5000mAh battery supports 25W wired charging and 15W wireless charging. While the physical capacity remains substantial, individual unit performance varies based on previous charging cycles and thermal degradation.
While the 108MP camera and 5000mAh battery remain physically capable, the lack of computational photography updates and battery optimization algorithms from newer Android versions limits real-world performance.
Unlocked Galaxy S21 Ultra: Availability and Options
Factory Unlocked Specifications
Factory-unlocked SM-G998U1 models provide the broadest carrier compatibility, supporting both GSM and CDMA networks across major domestic operators. These variants bypass carrier-specific bootloaders and bloatware while maintaining full 5G capability.
International Variant Considerations
Exynos 2100-powered international models (SM-G998B) offer different modem configurations than Snapdragon 888 North American variants. Buyers should verify FCC certification and specific 5G band support when purchasing imported units.
International unlocked models may lack specific 5G bands used by North American carriers. Verify FCC certification and carrier compatibility before purchasing imported units.
Galaxy S21 Ultra Support Timeline and Lifecycle
- : Samsung unveils the Galaxy S21 Ultra alongside the S21 series at Unpacked event.
- : Android 12 update deployment begins globally with One UI 4.0.
- : Sequential updates deliver Android 13 and Android 14 with four years of security patches promised.
- : Samsung removes S21 series from One UI 8 (Android 16) roadmap; refurbished market pricing drops below $300.
- : Final security maintenance releases conclude; device enters end-of-life status for software support.
Established Facts vs Remaining Uncertainties
Verified Information
- Exact pricing at major retailers ($226.95–$370)
- Software support termination (no Android 16)
- Trade-in valuations ($131 for S25 Ultra upgrades)
- Hardware specifications (108MP camera, 5000mAh)
Outstanding Questions
- Exact date of final security patch deployment
- Individual battery health variance in used units
- Future holiday promotional pricing fluctuations
- Long-term 5G network compatibility as standards evolve
The Aging Flagship Market Context
The 2021 flagship segment occupies a unique position in the mobile ecosystem. Devices like the S21 Ultra offer superior build quality and camera sensors compared to contemporary mid-range alternatives, yet lack the software longevity of newer flagships. This creates a calculated risk scenario where buyers exchange security updates for hardware capabilities.
Market data indicates strong demand for refurbished S21 Ultra units among photography enthusiasts and secondary device users. The 108MP sensor continues to outperform cameras found in $400–$500 retail phones, justifying purchases for specific use cases despite broader security concerns.
Retailer and Expert Perspectives
The S21 Ultra has entered an awkward phase in its lifecycle: too old for reliable long-term use given discontinued software support, yet still priced too high relative to newer alternatives.
— UpTrade Analysis, 2025
Trading in toward a Galaxy S25 Ultra yields approximately $131 in savings, but Samsung’s limited-time deals without trade-in can save customers up to $450.
— SamMobile Trade-In Investigation
Final Assessment for Prospective Buyers
The Galaxy S21 Ultra presents a viable short-term solution for users prioritizing camera quality over security updates, particularly when purchased below $250. However, the APA 7th Edition Citation Guide suggests careful verification of sources when evaluating retailer claims about certified refurbished conditions. For primary device usage exceeding twelve months, the Galaxy S22 Ultra offers superior value through ongoing software support and comparable pricing.
Frequently Asked Questions
Does the Galaxy S21 Ultra still receive software updates?
No. Samsung discontinued the S21 Ultra from its One UI 8 and Android 16 roadmap. The device no longer receives feature updates or monthly security patches, though it remains on Android 14.
What is the current price history trend for the S21 Ultra?
Prices dropped from $1,199 at launch to $226–$370 for refurbished units in 2025. The steepest declines occurred after Samsung announced the end of software support, accelerating depreciation.
Is purchasing a refurbished Galaxy S21 Ultra safe?
Certified refurbished units from Back Market, Best Buy, and UpTrade include functionality testing and limited warranties. However, battery degradation varies by individual unit usage history.
How does the S21 Ultra battery perform after four years?
The 5000mAh capacity remains physically intact, but individual battery health varies based on previous charging cycles. Expect 15–25% reduction in maximum capacity compared to new units.
Should I choose the S21 Ultra or S22 Ultra?
The S22 Ultra offers better value at similar price points ($230+ during promotions) with longer software support, newer processor, and improved camera algorithms.
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