Galaxy S21 Ultra 5G • Unlocked vs iPhone 15 Pro Max • Unlocked

The Samsung Galaxy S21 Ultra 5G, released in January 2021, and the iPhone 15 Pro Max, launched in September 2023, represent premium offerings from their respective manufacturers. While both are high-end smartphones, they operate on different ecosystems – Android for the Galaxy S21 Ultra 5G and iOS for the iPhone 15 Pro Max – and reflect distinct design philosophies and technological advancements over their release timelines. The primary differences lie in their age, software support longevity, and the evolution of their camera systems and processing power.

When considering the practical lifespan of these devices, several factors come into play, including their release age, software support, and physical construction.

• Software Longevity: The Samsung Galaxy S21 Ultra 5G, released in January 2021, received its final major Android operating system update (Android 15/One UI 7.0) in the first half of 2025, with security updates concluding around early 2026. In contrast, the iPhone 15 Pro Max, launched in September 2023, is guaranteed a minimum of five years of software support from its release date, extending at least until September 2028, with Apple typically providing longer support for both iOS versions and security patches.
• Physical Durability: The Galaxy S21 Ultra 5G features Gorilla Glass Victus on both its front and back, paired with an aluminum frame. The iPhone 15 Pro Max utilizes a Ceramic Shield front cover, a textured matte glass back, and a titanium frame, which contributes to a lighter build. Both devices carry an IP68 rating for dust and water resistance, indicating a similar level of protection against environmental elements.
• Expected Practical Lifespan: Users of the Galaxy S21 Ultra 5G may find its software support reaching its conclusion, potentially impacting access to the newest features and security enhancements. The iPhone 15 Pro Max, being a newer device with a longer guaranteed support period, offers a more extended timeline for receiving the latest software and security updates.

The performance of a smartphone is crucial for daily tasks, from app usage to demanding multimedia applications and gaming.

• Processing Power: The Galaxy S21 Ultra 5G, powered by a processor from early 2021, handles everyday applications and multitasking efficiently. For its time, it offered flagship-level speed and responsiveness. The iPhone 15 Pro Max, featuring a more recent and advanced processor, delivers a noticeable boost in speed and efficiency, particularly for intensive tasks like high-fidelity gaming, video editing, and running multiple demanding applications simultaneously.
• Multitasking and Storage: The Galaxy S21 Ultra 5G was available with 12GB or 16GB of RAM and storage options up to 512GB. The iPhone 15 Pro Max comes with 8GB of RAM and storage configurations up to 1TB. While the Galaxy S21 Ultra 5G offers higher RAM numbers, the iPhone's optimized software and hardware integration allow for smooth multitasking and efficient memory management, providing a fluid user experience.
• Battery Behavior: The Galaxy S21 Ultra 5G is equipped with a 5000 mAh battery. While capable of all-day use, some users reported that enabling the highest display resolution and refresh rate could lead to more frequent charging. The iPhone 15 Pro Max, with a 4441 mAh battery, is noted for its excellent battery life, often lasting through a full day of heavy use and sometimes extending into a second day for moderate users.

The display is a primary interface for smartphone interaction, and both devices offer high-quality viewing experiences with distinct characteristics.

• Display Technology and Clarity: The Samsung Galaxy S21 Ultra 5G features a 6.8-inch Dynamic AMOLED 2X display with a QHD+ resolution (3200x1440 pixels). This results in a very sharp and vibrant image with deep blacks. The iPhone 15 Pro Max has a 6.7-inch Super Retina XDR OLED display with a resolution of 2796x1290 pixels. Both offer excellent clarity for text, images, and video.
• Brightness and Smoothness: The Galaxy S21 Ultra 5G provides an adaptive 120Hz refresh rate and can reach a peak brightness of 1500 nits. The iPhone 15 Pro Max also features a 120Hz ProMotion adaptive refresh rate and can achieve a higher peak brightness of 2000 nits for outdoor viewing, making it more visible in direct sunlight. The iPhone 15 Pro Max also includes an Always-On display and the Dynamic Island, which integrates notifications and activities into a fluid interface element.
• Viewing Experience: Both displays offer smooth scrolling and responsive touch interaction due to their high refresh rates. The iPhone 15 Pro Max's higher peak brightness can be advantageous for outdoor visibility, while the Galaxy S21 Ultra 5G offers a slightly larger screen area.

Both smartphones are equipped with advanced camera systems designed to capture high-quality photos and videos, though they approach imaging with different strengths.

• Rear Camera Systems: The Galaxy S21 Ultra 5G boasts a versatile quad-camera setup, including a 108MP main sensor, a 12MP ultrawide, and two 10MP telephoto lenses offering 3x and 10x optical zoom. This configuration provides extensive zoom capabilities. The iPhone 15 Pro Max features a triple-camera system with a 48MP main sensor, a 12MP ultrawide, and a 12MP telephoto lens with 5x optical zoom.
• Photography Performance: The Galaxy S21 Ultra 5G was praised for its detailed images and impressive optical zoom range, particularly the 10x telephoto. The iPhone 15 Pro Max is noted for its excellent overall image quality, strong low-light performance, and the quality of its 5x telephoto lens.
• Video Capabilities: The Galaxy S21 Ultra 5G supports 8K video recording. The iPhone 15 Pro Max offers advanced video features like ProRes video recording and Cinematic mode, providing professional-grade control and quality for content creators. Both devices feature high-resolution front-facing cameras for selfies and video calls.