Samsung Galaxy S25 Ultra Review: Samsung's Most Refined Ultra Phone Yet

Lead-In

The Samsung Galaxy S25 Ultra arrives as the latest flagship in Samsung's celebrated Ultra lineup, and it represents something different from its predecessors. Rather than chasing raw specifications alone, Samsung has refined the formula with a titanium frame, improved Galaxy AI features, and a processor specifically tuned for this device. At $1,299, it sits at the very top of Samsung's smartphone hierarchy, positioned to compete against Apple's finest.

Having spent considerable time with the Galaxy S25 Ultra, I can tell you that this phone represents Samsung's most polished Ultra experience to date. The device feels premium in the hand, runs smoothly under pressure, and delivers a camera system that consistently produces excellent results. Whether you're upgrading from an older Samsung device or switching from another platform entirely, the S25 Ultra makes a compelling case for itself.

The question isn't whether the Galaxy S25 Ultra is a good phone. It absolutely is. The real question is whether the refinements justify the premium price tag, and whether the AI features actually deliver meaningful value in everyday use. Let's dive deep into every aspect of this device.

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Testing Methodology

Before diving into the specifics, let me explain how I approached this review. I tested the Samsung Galaxy S25 Ultra over a two-week period as my primary device. My testing included:

• Daily driver usage: Calls, messaging, email, social media, web browsing, and streaming video
• Camera testing: Hundreds of photos across various lighting conditions, including daylight, indoor, low-light, night mode, zoom capabilities, and video recording
• Performance benchmarking: Gaming sessions, multitasking, app launch speeds, and sustained performance under load
• Battery testing: Full day battery tests, screen-on time measurements, charging speed verification, and standby drain assessment
• AI feature evaluation: Testing Galaxy AI features including Circle to Search, Live Translate, Photo Assist, and Note Assist
• Connectivity testing: 5G performance, Wi-Fi stability, Bluetooth pairing, and GPS accuracy

All tests were conducted on a retail unit purchased at full price to ensure objectivity.

Hardware & Industrial Design

Samsung has made some notable changes to the Galaxy S25 Ultra's design, and the most significant is the titanium frame that replaces the aluminum of previous generations. This isn't just a marketing change — titanium genuinely feels different in the hand. It's lighter than stainless steel while still providing excellent rigidity, and the rounded edges of the frame make the phone more comfortable to hold than its boxy predecessors.

The S25 Ultra measures 162.8 x 77.6 x 8.2 mm and weighs 218 grams, which is remarkably manageable for a phone with a 6.8-inch display. The weight distribution feels balanced, and I never felt like the phone was going to slip from my grip during one-handed use.

The back panel features Samsung's signature matte glass finish, which does an excellent job of resisting fingerprints and smudges. My unit stayed relatively clean even after several days of use without a case. The camera module on the back will be familiar to anyone who has seen recent Samsung flagships — five distinct lenses arranged in a grid pattern with a sleek metal housing.

Samsung has retained the S Pen slot at the bottom of the device, and the stylus itself has received subtle improvements. The S Pen now has improved latency for those who use it for notes or drawing, and the air gesture features work more reliably than in previous generations.

On the right side, you'll find the power button and volume rockers, all of which have excellent tactile feedback. The buttons feel solid with no wobble, and the placement is intuitive. The bottom houses the USB-C port (USB 3.2 Gen 1), the S Pen slot, and a single speaker grille that pairs with the top speaker for stereo sound.

The phone carries an IP68 rating for water and dust resistance, meaning it can survive submersion in up to 1.5 meters of water for 30 minutes. This is standard for modern flagship phones, but it's still reassuring to have.

One thing worth noting: Samsung has eliminated the curved display edges that characterized previous Ultra models. The S25 Ultra features a flat display with only the slightest curve at the very edges, which improves usability and makes the S Pen experience more natural. This is a change I genuinely appreciate.

For more detailed comparisons with competing flagship phones, check out our Samsung Galaxy S25 review and our broader smartphone buying guide.

Display

The Samsung Galaxy S25 Ultra features a 6.8-inch Dynamic AMOLED 2X display with a resolution of 3088 x 1440 pixels. This translates to an impressive pixel density that makes everything from text to images look crisp and detailed. The display supports up to 120Hz refresh rate with adaptive technology that can drop as low as 1Hz when static content is displayed to conserve battery.

Brightness is where Samsung truly excels. The S25 Ultra can reach peak brightness levels of 2,600 nits, which makes it one of the brightest smartphone displays available. I tested this extensively in direct sunlight, and the screen remained perfectly readable even on the sunniest days. Colors never washed out, and I didn't have to squint or find shade to check notifications.

Color accuracy is excellent out of the box. The display supports 100% DCI-P3 color gamut coverage, and Samsung's display settings allow you to choose between Vivid mode (the default with saturated colors) and Natural mode (more accurate, sRGB-based colors). Both look excellent, and the choice comes down to personal preference.

HDR content looks spectacular on this display. Streaming HDR videos from Netflix, Amazon Prime Video, and YouTube reveals deep blacks, bright highlights, and rich, saturated colors. The display truly shines when watching movies or TV shows, with Samsung's history as a TV manufacturer clearly evident in how well the S25 Ultra handles video content.

Always-on display functionality works as expected, showing time, date, battery level, and notification icons when the phone is locked. You can customize what information appears and can even use limited widgets on the always-on display.

The under-display ultrasonic fingerprint sensor has been improved over previous generations. It's faster and more reliable, rarely requiring more than a quick tap to unlock the phone. I found it worked consistently even with slightly damp fingers, which is a welcome improvement.

Performance

At the heart of the Samsung Galaxy S25 Ultra lies the Snapdragon 8 Gen 3 for Galaxy — a specially tuned version of Qualcomm's flagship processor. This isn't just a renamed chip; Samsung has worked with Qualcomm to optimize the processor specifically for this device, resulting in improved performance and efficiency.

The processor is paired with 12GB of RAM as standard, with storage options of 256GB, 512GB, or 1TB. There's no expandable storage via microSD card, which means you'll need to choose your storage capacity carefully at purchase time.

In everyday use, the S25 Ultra flies. Apps open instantly, multitasking is smooth, and I never experienced any lag or stutter during my testing period. The 120Hz display contributes significantly to this feeling of speed — scrolling through social media feeds, web pages, and app lists is buttery smooth.

Gaming performance is excellent. I tested several demanding games including Genshin Impact, Call of Duty: Mobile, and Fortnite, and the S25 Ultra handled them all at high settings without any issues. The phone did get warm during extended gaming sessions, but never uncomfortably so, and thermal throttling was minimal even during hour-long gaming sessions.

Benchmark results reflect this real-world performance. The S25 Ultra scores at the top of every major benchmark, though I should note that benchmark scores don't always translate directly to real-world usability. What matters is how the phone feels in daily use, and in that regard, the S25 Ultra excels.

The phone supports 5G connectivity across both sub-6GHz and mmWave networks, ensuring compatibility with all major carriers. Wi-Fi 7 support provides the latest in wireless connectivity for homes and offices equipped with compatible routers. Bluetooth 5.3 ensures stable connections with wireless earbuds, speakers, and other accessories.

For those interested in productivity, Samsung's DeX mode allows you to connect the phone to a monitor and use it like a desktop computer. The experience isn't quite as refined as a true desktop OS, but it's useful for light work when you don't have access to a laptop.

Camera

The camera system is where Samsung has historically differentiated its Ultra models, and the S25 Ultra continues this tradition with a versatile quad-camera setup. The main sensor is a 200MP ISOCELL HP2, which uses pixel binning to produce detailed 12.5MP images by default. This allows for incredible detail in good lighting conditions while maintaining reasonable file sizes.

Joining the main sensor is a 50MP periscope telephoto lens with 5x optical zoom, a 10MP 3x telephoto lens, and a 12MP ultrawide lens with a 120-degree field of view. This combination provides flexibility that few other phones can match, covering everything from macro-style close-ups to extremely zoomed-in shots.

In daylight conditions, the S25 Ultra produces excellent photos with accurate colors, good dynamic range, and plenty of detail. Samsung's image processing has become more refined over the generations, with less of the aggressive sharpening and oversaturation that characterized older Samsung phones. Images look natural while still being visually appealing.

The 5x optical zoom is one of my favorite features. It provides a focal length that's perfect for portraits and distant subjects, and the image quality at 5x is outstanding. Samsung also offers AI-powered zoom enhancement that can extend the effective zoom range to 10x with minimal quality loss, though the best results still come from the optical focal lengths.

Portrait mode works well, with accurate edge detection and pleasing background blur. Samsung offers several blur intensity levels and even a studio lighting effect that can dramatically change the look of your portraits. Selfies taken with the 12MP front camera are sharp and well-exposed, with a wide enough field of view for group photos.

Low-light photography is where the S25 Ultra really shines. Night mode activates automatically when lighting is poor, and the results are impressive. Images remain detailed with manageable noise levels, and colors are preserved better than most competing phones. The main sensor's large size and pixel binning capabilities contribute significantly to this performance.

Video recording supports up to 8K at 30fps from the main camera, though 4K at 60fps is more practical for most users. Video quality is excellent, with good stabilization from both optical and electronic sources. The S25 Ultra handles autofocus smoothly during video recording, and the audio quality from the built-in microphones is clear and well-balanced.

For those interested in astrophotography, Samsung includes a dedicated mode that allows for long-exposure shots of the night sky. Combined with a tripod, you can capture impressive shots of stars and even the Milky Way.

If you're considering other Samsung options, you might also want to read our Samsung Galaxy S24 Ultra review to see how the camera system has evolved from the previous generation.

Battery

The Samsung Galaxy S25 Ultra houses a 5,000mAh battery, which is the same capacity as its predecessor. While some might have hoped for a larger battery, Samsung has instead focused on efficiency improvements through both hardware and software optimizations.

In practice, battery life is excellent. During my testing, I consistently achieved 6-7 hours of screen-on time with my typical daily usage, which includes browsing, email, social media, streaming video, and some camera usage. This was enough to get me through a full day with 20-30% battery remaining at bedtime.

Standby drain is minimal. The phone loses only 2-3% battery overnight when left untouched, which means you won't wake up to a significantly depleted phone even after 8 hours off the charger.

When you do need to charge, the S25 Ultra supports 45W wired charging via USB Power Delivery. In my testing, this took the phone from 0% to 100% in approximately 55 minutes, which is competitive with other flagship phones. A 15-minute charge typically provided around 30% battery, which is enough for several hours of moderate use.

Wireless charging is supported at up to 15W with compatible Qi chargers. Wireless charging is slower than wired but convenient for desk use or overnight charging. The S25 Ultra also supports reverse wireless charging at 4.5W, allowing you to charge other devices like wireless earbuds by placing them on the back of the phone.

One notable improvement is improved thermal management during charging. The S25 Ultra stays cooler during charging than previous generations, which Samsung attributes to both hardware refinements and software optimizations. This is particularly noticeable during fast charging, where the phone no longer gets noticeably warm.

Related Reviews: Xiaomi 17 Ultra · Google Pixel 10 Pro · Google Pixel 10a · Galaxy Tab S10 FE

Software

The Samsung Galaxy S25 Ultra ships with Android 15 and Samsung's One UI 7 overlay. Samsung has committed to 7 years of OS updates and 7 years of security updates, which is among the best update policies in the Android ecosystem. This means the phone will receive Android updates through 2032, making it a sound investment for the long term.

One UI 7 refines the Samsung experience with a cleaner visual design and improved organization. Settings menus are more intuitive, the notification shade has been redesigned, and there are new customization options for the lock screen and home screen. Samsung has also improved the integration between its various apps, creating a more cohesive ecosystem experience.

Galaxy AI is a major focus for Samsung, and the S25 Ultra includes several AI-powered features. Circle to Search with Google lets you search for anything on screen by simply circling it, whether it's a product in an online store or a landmark in a photo. This feature works surprisingly well and has become one of my most-used Galaxy AI features.

Live Translate provides real-time translation during phone calls, translating both sides of the conversation. The translations aren't perfect, but they're good enough to have a basic conversation with someone who speaks a different language. This feature works entirely on-device, preserving privacy.

Photo Assist uses generative AI to help edit photos in sophisticated ways. You can move objects, resize them, or remove unwanted elements, with the AI filling in the background realistically. The results are impressive, though you should be careful about how you use AI-edited images.

Note Assist can transcribe, summarize, and translate voice recordings. For students or professionals who record meetings, this feature can be a significant time-saver. The transcription accuracy is good for clear audio, though background noise can affect results.

Samsung's software commitment extends beyond core updates. The company regularly releases feature updates that add new capabilities throughout the phone's lifespan. Previous flagships have received significant feature enhancements months after launch, suggesting that Samsung is committed to improving its devices over time rather than focusing only on new releases.

Bloatware remains a minor issue. Samsung includes several apps that duplicate Google services, and some carrier apps may be pre-installed depending on where you purchase the phone. Most of these can be disabled or hidden, but it would be nicer not to have to deal with them in the first place.