Galaxy S21 Ultra Upgrade Guide: Top 2025 Replacement Options

Samsung’s Galaxy S21 Ultra is officially at the end of its software support lifecycle. The 2021 flagship received its final major OS update earlier this year. This leaves long-time users facing a critical upgrade decision for the first time.

According to reports from Reuters, the device’s end-of-support marks a significant shift for a beloved model. Many users held onto it specifically to avoid the integrated S Pen design of later Ultra models.

Evaluating Your Next Smartphone Move

Your primary choice revolves around the S Pen. The Galaxy S22 Ultra and subsequent models adopted a Note-like design with built-in stylus support. If you want to avoid this, you must leave the Ultra line entirely.

Thankfully, Samsung’s 2025 lineup offers compelling alternatives. The Galaxy S25+ provides a premium experience without the stylus. The Galaxy S25 Edge features a titanium build and ultra-thin design for a distinct feel.

For those seeking a completely different form factor, the Galaxy Z Fold 7 and Z Flip 7 present innovative foldable options. These devices offer unique user experiences not available with traditional smartphones.

Why The S21 Ultra Was a Turning Point

The Galaxy S21 Ultra represented the peak of Samsung’s classic flagship design philosophy. It was the last Ultra model before the company merged the Note series into the S-line. This change alienated some purists who preferred the S-series’ original direction.

Its successor, the S22 Ultra, fully embraced the Note identity with squared-off edges and S Pen integration. This pivot fundamentally changed what the “Ultra” designation meant for Samsung consumers moving forward.

For S21 Ultra loyalists, the 2025 smartphone market offers both familiar and revolutionary paths forward. The key is identifying which features matter most in a post-S21 Ultra world.

Info at your fingertips

When will Samsung stop security updates for the S21 Ultra?

Samsung is expected to halt all security updates for the Galaxy S21 Ultra in early 2026. This typically occurs around five years after the device’s initial release date.

What is the most direct S21 Ultra replacement?

The Galaxy S25+ offers the most similar experience without an S Pen. For those wanting the Ultra tier, the S25 Ultra remains the flagship despite its integrated stylus.

Are foldable phones reliable enough now?

Modern foldables like the Z Fold 7 have significantly improved durability. According to industry assessments, they now offer reliability comparable to traditional smartphones for most users.

Should I wait for the Galaxy S26 series?

If your S21 Ultra remains functional, waiting for the S26 launch could be worthwhile. The timing aligns closely with when Samsung will completely end support for your current device.

What happens if I keep using my S21 Ultra unsupported?

Continuing to use an unsupported device increases security vulnerabilities over time. You won’t receive patches for newly discovered exploits, potentially risking your personal data.

Trusted Sources

Reuters, Associated Press, Samsung Official Communications