Samsung S21 5g Vs S9 Is Upgrading Really Worth It In 2024

For users still holding onto the Samsung Galaxy S9, the decision to upgrade in 2024 isn’t as straightforward as it once was. The S9, released in 2018, was a flagship powerhouse in its time—excellent display, solid build quality, and one of the best single cameras on any phone at launch. But five years later, technology has advanced dramatically. Enter the Samsung Galaxy S21 5G, a 2021 device that brought modern features like 5G connectivity, enhanced processing power, and a more refined design. So, if you're still on an S9, is moving to the S21 5G actually worthwhile in 2024? Let’s break down the key differences and real-world implications.

Performance: From Flagship of Its Era to Modern Multitasking

The Galaxy S9 ran on either the Qualcomm Snapdragon 845 (in U.S. models) or the Exynos 9810 (internationally), both of which were top-tier chipsets in 2018. At the time, they handled gaming, multitasking, and high-resolution media without breaking a sweat. Fast forward to 2024, and while the S9 can still manage basic tasks like calls, messaging, and light browsing, it struggles with heavier apps, newer games, and even some updates to popular software like Instagram or Chrome.

In contrast, the S21 5G launched with the Snapdragon 888 (or Exynos 2100 depending on region), a significant leap in CPU and GPU performance. This means faster app launches, smoother animations, better AI processing for photos, and improved efficiency under load. More importantly, the S21 supports newer versions of Android and receives longer software support—critical in 2024 where security patches and app compatibility are non-negotiable.

Tip: If your current phone lags when opening multiple apps or updating software, it's a strong sign that hardware limitations are affecting usability.

Display and Design: Subtle Evolution, Noticeable Improvements

Both phones feature premium builds with glass backs and aluminum frames, but the design language evolved between 2018 and 2021. The S9 had a curved edge display with noticeable bezels and a front-facing home button with integrated fingerprint sensor. The S21 5G ditches the physical button for an under-display ultrasonic fingerprint scanner and adopts a flatter, Infinity-O hole-punch display with slimmer bezels.

The screen size increased slightly—from 5.8 inches on the S9 to 6.2 inches on the S21—while maintaining a similar footprint due to higher screen-to-body ratio. Resolution remains Quad HD on both, but the S21 introduces a 120Hz adaptive refresh rate, making scrolling, gaming, and general navigation significantly smoother. This is one of the most tangible upgrades users notice immediately.

“Higher refresh rates change how we perceive responsiveness. Once you experience 120Hz, going back feels sluggish.” — David Kim, Mobile UX Analyst at TechInsight Group

Camera Comparison: Beyond Megapixels

The S9 featured a single 12MP rear camera with Dual Pixel autofocus and variable aperture (f/1.5–f/2.4), which delivered excellent low-light performance for its time. It was praised for natural color reproduction and reliable stabilization. However, it lacked versatility—no telephoto lens, no ultra-wide, just one capable shooter.

The S21 5G expands this into a triple-camera system: 12MP wide, 12MP ultra-wide, and a 64MP telephoto with up to 3x hybrid zoom. While the primary sensor doesn’t drastically outperform the S9 in daylight, computational photography improvements—especially night mode, HDR, and AI scene optimization—make a big difference. Video recording jumps from 4K@30fps on the S9 to 8K@24fps on the S21, though most users will benefit more from improved stabilization and dynamic range.

Feature	Samsung S9	Samsung S21 5G
Processor	Snapdragon 845 / Exynos 9810	Snapdragon 888 / Exynos 2100
Display	5.8\", 1440p, 60Hz	6.2\", 1440p, 120Hz Adaptive
Rear Cameras	12MP (f/1.5–2.4)	12MP + 12MP + 64MP
Front Camera	8MP	10MP
Battery	3000mAh	4000mAh
Charging	Fast charging (15W), Wireless	Fast charging (25W), Wireless, Reverse Wireless
Software Support	Ended (Android 10)	Ongoing (Up to Android 14+, Security until 2025+)
5G Connectivity	No	Yes

Battery Life and Charging: Real-World Impact

The S9’s 3000mAh battery was modest even in 2018. With moderate use, it lasted a full day, but heavy usage often required midday charging. By 2024 standards, that capacity is severely limiting, especially as background processes and app demands have grown.

The S21 5G’s 4000mAh battery offers about 30% more capacity and benefits from more efficient software optimization. In real-world testing, it consistently delivers 1.5 days of light use or a full day of heavy use. Additionally, it supports faster charging (up to 25W with compatible chargers), wireless charging, and even reverse wireless charging—allowing you to power up earbuds or another phone using the S21 itself.

Long-Term Value and Future-Proofing in 2024

This is where the decision becomes less about specs and more about practical longevity. As of 2024, the S9 no longer receives official software updates or security patches from Samsung. That means vulnerabilities remain unpatched, and newer apps may stop supporting the device entirely. Google has also begun restricting certain Play Store functions on outdated Android versions.

The S21 5G, while not the newest model, still receives monthly security updates and is eligible for Android 14. It will likely continue receiving patches into late 2025, giving it several more years of safe, functional use. Add to that 5G support—which is now standard across carriers—and you’re better positioned for future network transitions.

Tip: Always check a device’s official update policy before upgrading. Long-term software support is often more valuable than raw hardware.

Mini Case Study: Maria’s Upgrade Journey

Maria had used her Galaxy S9 since 2018. By early 2023, she noticed apps crashing, slow boot times, and increasing difficulty using mobile banking apps that required newer OS versions. She considered buying a budget phone but opted for a refurbished S21 5G after reading about its update schedule. Within days, she reported faster performance, better camera quality for family photos, and relief from constant charging anxiety. Most importantly, her banking and productivity apps now work seamlessly. For her, the upgrade wasn’t about luxury—it was about staying connected and secure.

Is Upgrading Really Worth It? A Step-by-Step Decision Guide

If you're still on the fence, follow this practical timeline to assess whether an upgrade makes sense:

1. Evaluate Daily Usability: Does your S9 lag during calls, browsing, or app switching?
2. Check App Compatibility: Are key apps (banking, social media, work tools) functioning properly?
3. Review Battery Health: Does the battery drain within half a day, even with light use?
4. Assess Security Needs: Are you missing critical security updates? (Check Settings > About Phone > Software Update)
5. Consider Future Use: Do you plan to keep the phone for another year or more?

If you answered “yes” to two or more of these, upgrading to the S21 5G—or a similar modern mid-range device—is a smart investment.

Frequently Asked Questions

Can the S9 still be used safely in 2024?

Possibly, but not recommended for sensitive tasks like online banking or email. Without security updates, it’s vulnerable to exploits. Use only for basic functions if you must keep it.

Is the S21 5G still available new?

New units are rare since it’s a 2021 model, but certified refurbished or lightly used devices are widely available through reputable retailers and often come with warranties.

Will the S21 5G get Android 15?

Unlikely. Samsung typically provides three major OS updates. The S21 launched with Android 11 and received Android 12, 13, and 14. No further major upgrades are expected, but security patches may continue into 2025.

Conclusion: Time to Move Forward

The Galaxy S9 was a landmark device, but technology waits for no one. In 2024, the S21 5G offers meaningful improvements in performance, display fluidity, camera flexibility, and long-term reliability. It bridges the gap between legacy hardware and modern expectations, making it a sensible upgrade path for S9 owners.

You don’t need the latest flagship to stay current—just a device that keeps up with today’s digital demands. If your S9 is showing signs of age, the move to the S21 5G isn’t just about better specs; it’s about regaining confidence in your phone’s speed, safety, and usability.

🚀 Ready to upgrade? Explore certified refurbished S21 5G models today and experience what modern Android has to offer—without paying flagship prices.