Galaxy S21 Ultra to Buy: Refurbished Worth It Before 2026?

A used Galaxy S21 Ultra 5G can set you back less than a third of its original price—if you know where to look and what to watch out for. Irish retailers are now advertising the 2021 flagship for as little as €324.99, with warranties ranging from 12 to 36 months. The catch: Samsung’s official security updates for the S21 series end in early 2026, so the clock is already ticking. This guide walks you through current prices, retailer policies, and whether that discount is worth it.

Refurbished Savings: Up to 70% cheaper than new · Maximum Warranty: 36 months · Support End: January 2026 · Lowest Found Price: €324.99 · Return Window: 30 days

How much is the S21 Ultra worth today?

Five Irish retailers currently list refurbished Galaxy S21 Ultra 5G units, with prices clustering between €324.99 and €433 for the 128GB model. Smart Cellular is advertising the lowest price at €324.99 for a 128GB unit—a special offer down from a regular price of €424.99 (Smart Cellular). Refurbed lists the same capacity at €433, while alloallo and ViberStore position themselves slightly higher (Refurbed).

The new retail price for a Galaxy S21 Ultra 5G still sits at €1,290.00 as of April 2026, according to Back Market’s price guide. That means even at the upper end of the refurbished market, buyers are looking at roughly a third of the original cost. Back Market itself offers devices at up to 70% cheaper than new, making it the deepest discount among major marketplaces (Back Market Price Guide).

Trade-in values

The research notes don’t include current trade-in figures for Ireland, but the broader pattern suggests older flagship phones depreciate fastest when new generations arrive. Back Market’s price guide from August 2025 showed refurbished units starting at €319.00—suggesting a floor that has since risen slightly with demand from budget-conscious upgraders (Back Market Price Guide).

If you’re trading in your current phone, retailers like ViberStore and Refurbed may offer separate trade-in programs, but specific Irish trade-in values weren’t available in the research data. Comparing these offers against selling privately via platforms like Adverts.ie or Facebook Marketplace typically yields 10–20% more, though it involves more effort.

Refurbished prices in Ireland

Back Market categorizes refurbished devices into three condition tiers: Fair (visible signs of wear), Good (light wear), and Excellent (barely perceptible or perfect). The lowest prices typically land on Fair or Good units, while Excellent grades command a premium of roughly €30–€50 above the baseline (Back Market Price Guide).

alloallo describes its refurbished devices as 100% functional with aesthetic condition close to new, and includes a new battery with every unit—a notable differentiator when most retailers only guarantee 80% battery health (alloallo).

Is the S21 Ultra still supported?

Samsung’s official security update timeline for the Galaxy S21 series appears to end in January 2026, based on community discussions in Samsung forums. The company’s Certified Re-Newed program offers a one-year limited warranty on refurbished Galaxy phones—a timeframe that aligns with this support window (Samsung Official).

What this means practically: after January 2026, the Galaxy S21 Ultra 5G will no longer receive official firmware updates, security patches, or new Android features from Samsung. Apps downloaded from the Google Play Store may gradually drop support for older Android versions over the following 12–24 months, potentially limiting access to banking apps, streaming services, and other software that requires current security standards.

Software updates timeline

Samsung typically supports its flagship devices for four years of Android updates and five years of security patches. The Galaxy S21 series launched with Android 11 in January 2021, meaning it has already received four major Android upgrades and is approaching the end of its security support cycle. Buying a refurbished unit now means owning a device that will be past its official update window within 9–10 months of purchase.

End of life January 2026

Devices purchased now will technically remain functional after the support cutoff, but they’ll be running without security patches—an increasingly risky proposition as apps and services tighten their minimum requirements. For buyers who rely on their phone for banking, email, or other sensitive activities, this timeline is the central trade-off against the attractive price point.

Is the Samsung S21 Ultra a good phone?

By 2021 standards, the Galaxy S21 Ultra was Samsung’s most capable flagship: a 6.8-inch Dynamic AMOLED display with 120Hz refresh rate, the Contour-Cut camera array capable of 8K video recording, and 12GB RAM standard across most models. These specifications still hold up well against mid-range phones released in 2024–2025, making the S21 Ultra a compelling option for buyers who prioritize camera quality and display performance over the latest processor generation.

The phone’s hardware durability is solid: an aluminium frame, Gorilla Glass Victus front and back, and IP68 water resistance. The 5,000mAh battery supports 25W wired charging and 15W wireless charging. For Irish buyers who want a premium phone experience without paying premium prices, the S21 Ultra’s 2021 hardware significantly outperforms most budget phones currently on the market.

Review highlights

Independent reviews from 2021 praised the S21 Ultra’s camera versatility, display quality, and S Pen support—a first for the Galaxy S series. Critics noted the Exynos 2100 processor’s thermal management as a weakness under sustained load, and the lack of a charger in the box as a cost-cutting measure that persists in refurbished units today.

The consensus among reviewers then, and what holds true now: the Galaxy S21 Ultra delivers flagship performance and features at a price that no longer requires flagship spending. The trade-off is a device entering its support window where it will age faster than buyers might expect from a Samsung purchase.

Is S21 or S24 better?

The Galaxy S24 Ultra, Samsung’s 2024 flagship, starts at approximately €1,399 in Ireland—only €110 more than the new S21 Ultra 5G. This pricing creates an interesting decision point: for a modest premium over a new S21 Ultra, buyers can get a device with three additional years of security support, a newer Snapdragon 8 Gen 3 processor, and titanium frame construction.

However, refurbished S21 Ultra units at €324–€433 represent savings of roughly €960–€1,065 compared to a new S24 Ultra. For buyers who primarily use their phone for calls, messaging, social media, and photography—and who plan to upgrade again within 2–3 years—the S21 Ultra’s price advantage may outweigh the S24’s longevity benefits.

Key spec differences

Value comparison

The Galaxy S21 Ultra makes financial sense for budget-conscious buyers who accept its limited support window. The Galaxy S24 Ultra makes sense for buyers who can stretch their budget and want a device that will remain secure and supported through 2028–2029. The decision hinges on whether three additional years of support—plus the processor, camera, and display upgrades—are worth roughly €960 in extra spending.

How many years will the Samsung S21 Ultra last?

Hardware longevity for the Galaxy S21 Ultra is strong: the aluminium frame, Gorilla Glass Victus, and IP68 rating mean the device can physically survive 4–5 years of daily use without significant degradation. The question isn’t whether the hardware will hold up—it’s whether the software will remain secure.

After January 2026, Samsung will no longer push security patches to the S21 series. Over the following 12–18 months, apps that require current TLS standards and security APIs will begin dropping support for the device. Banking apps, Google Pay, and streaming services like Netflix and Spotify will likely start displaying compatibility warnings by late 2026 or early 2027.

Hardware durability

The 2021 flagship hardware genuinely outlasts its successor in several physical respects: the 108MP camera sensor still produces excellent photos, the 5,000mAh battery provides all-day usage, and the 120Hz display remains competitive with current mid-range offerings. alloallo’s inclusion of a new battery in refurbished units mitigates the primary hardware concern for phones approaching four years old (alloallo).

Support lifespan

Samsung’s official support timeline puts the S21 Ultra at approximately 5 years from launch—standard for flagship devices but shorter than the 7-year commitment now offered by Google for its Pixel phones. Buyers should plan to replace their S21 Ultra by 2027 at the latest if they rely on banking or payment apps, or by 2028 if their usage is limited to calls, messaging, and social media.

“We want you to love your phone. If you change your mind for any reason, you’ve got 30 days to send it back for free.”

— ViberStore (Irish refurbished phone retailer)

“All Samsung Certified Re-Newed smartphones come with a one-year limited warranty, just like our brand new smartphones.”

— Samsung (manufacturer)

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In Ireland, refurbished Galaxy S21 Ultra prices from €110 make it a strong contender before support fully ends in 2026.

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