Galaxy S21 FE 5G • Unlocked vs Galaxy S25 Ultra • Unlocked

The Samsung Galaxy S21 FE 5G, released in January 2022, and the Samsung Galaxy S25 Ultra, launched in January 2025, represent different tiers and generations within Samsung's smartphone lineup. While both operate on the Android platform, the S25 Ultra, as a more recent flagship, incorporates advancements in processing power, camera technology, and display quality. The S21 FE 5G offers a balanced experience, while the S25 Ultra focuses on delivering a premium, cutting-edge mobile experience.

When considering the longevity of these devices, their respective release timelines and software support policies are key differentiators. The Galaxy S21 FE 5G, having been released in early 2022, launched with Android 12 and is expected to receive up to four major Android OS updates, extending its software support until approximately January 2027. The Galaxy S25 Ultra, a 2025 release, benefits from Samsung's extended software commitment, offering up to seven years of major OS and security updates, projecting support until 2032. Both devices feature an IP68 rating for dust and water resistance, indicating a similar level of protection against environmental elements.

• Software Updates: The Galaxy S25 Ultra offers a significantly longer period of software support, ensuring access to the latest Android features and security patches for an extended duration compared to the S21 FE 5G.
• Physical Durability: Both models provide robust protection against dust and water, with the S25 Ultra featuring a more advanced build with a titanium frame and enhanced glass protection, suggesting greater resilience to daily wear and tear.
• Practical Lifespan: Users prioritizing the longest possible software longevity and cutting-edge hardware will find the S25 Ultra more aligned with their needs, while the S21 FE 5G still offers a respectable lifespan for those seeking a reliable device for several years.

The performance capabilities of the Galaxy S21 FE 5G and the Galaxy S25 Ultra reflect their generational gap, with the newer device offering substantial enhancements for demanding tasks. The S21 FE 5G, equipped with a processor from its era, handles everyday applications, multitasking, and moderate gaming smoothly. Its configurations typically include 6GB or 8GB of RAM and 128GB or 256GB of internal storage.

• Processing Power: The Galaxy S25 Ultra features a significantly more advanced processor, enabling exceptionally fast app loading, seamless multitasking with numerous applications open, and a superior experience for graphically intensive games and complex AI-driven tasks.
• Battery Behavior: The S21 FE 5G has a 4500 mAh battery, providing a full day of typical use for many users. The S25 Ultra, with its 5000 mAh battery and a more power-efficient processor, is designed to offer extended usage times, even under heavy workloads.
• System Responsiveness: The S25 Ultra delivers a noticeably more responsive and fluid user experience across the operating system and within applications, benefiting from its advanced hardware and optimized software.

Both devices feature Samsung's Dynamic AMOLED 2X display technology, known for its vibrant colors and deep blacks, but the S25 Ultra introduces several advancements in screen quality. The Galaxy S21 FE 5G has a 6.4-inch display with a Full HD+ resolution and a 120Hz refresh rate, providing a smooth viewing experience.

• Display Technology and Clarity: The Galaxy S25 Ultra boasts a larger 6.9-inch Dynamic AMOLED 2X display with a higher QHD+ resolution, offering greater detail and sharpness for content consumption and productivity.
• Brightness and Outdoor Visibility: The S25 Ultra's display achieves higher peak brightness levels, which translates to improved visibility and readability in bright outdoor conditions compared to the S21 FE 5G.
• Refresh Rate and Smoothness: While both offer a 120Hz refresh rate, the S25 Ultra features an adaptive refresh rate that can scale down to 1Hz, contributing to better power efficiency while maintaining smooth visuals.

The camera systems on both the Galaxy S21 FE 5G and the Galaxy S25 Ultra are designed to capture high-quality images and videos, though the Ultra model features a more comprehensive and advanced setup. The S21 FE 5G includes a versatile triple-camera array with a 12MP main lens, a 12MP ultrawide, and an 8MP telephoto lens with 3x optical zoom, alongside a 32MP front camera.

• Photography Capabilities: The Galaxy S25 Ultra features a quad-camera system, including a 200MP main sensor, a 50MP ultrawide, a 50MP telephoto with 5x optical zoom, and a 10MP telephoto with 3x optical zoom, providing greater detail, flexibility, and zoom capabilities. Its larger sensors and advanced processing contribute to superior low-light performance and overall image quality.
• Video Recording Quality: The S25 Ultra supports higher resolution and frame rate video recording, including 8K at 30 frames per second, offering more detailed and cinematic video capture compared to the S21 FE 5G's 4K capabilities.
• Audio Experience: Both devices offer stereo speakers for an immersive audio experience during media consumption. The S25 Ultra's microphone quality is enhanced for clearer calls and recordings, benefiting from newer noise reduction technologies.