Samsung Galaxy S25 Edge: The Phone That Started a Thin War

There is a moment, somewhere in 2023 or 2024, when you picked up a flagship smartphone and thought — without quite articulating it — that it had reached a ceiling. Not a bad phone. An excellent phone. But a heavy phone, a thick phone, a phone that was unambiguously a slab of glass and metal that you carry around all day and gradually stop noticing because it has become unremarkable in its sameness.

Samsung noticed too. And on 13 May 2025, at a global live-streamed event that the company framed not as a product launch but as a philosophy statement, they unveiled the Galaxy S25 Edge.

Two words on the teaser image: Beyond Slim.

The phone itself turned out to be exactly that. At 5.8 millimetres thin and 163 grams, the S25 Edge is one of the thinnest flagship smartphones ever made — thinner than an Apple iPhone 16 Pro, thinner than a Google Pixel 9, thinner than almost anything else in a comparable price range. It slips into a front pocket and disappears. You reach for it and your hand registers almost nothing. That feeling, engineered and deliberate, is the entire point.

But there is a more interesting story here than just the dimensions. The S25 Edge arrived in a specific moment — a moment when the entire premium smartphone industry is recalibrating around a design philosophy that had been abandoned for years. And Samsung, by moving first, has set the terms of a competition that Apple, Xiaomi, Honor, and others are now scrambling to respond to.

How We Got Here: The Weight That Built Up Over a Decade

Smartphones got heavier and thicker for reasons that were, individually, entirely reasonable. Bigger batteries meant more weight. Larger sensors meant more camera module depth. Stronger screens meant more layers of protective glass. Better speakers meant acoustic chambers that took up physical space. Every improvement came with a gram or a millimetre attached.

By 2023, flagship phones routinely weighed over 200 grams and exceeded 8 millimetres in thickness. Nobody complained loudly — the features were worth it, and the trade-off had been made so gradually that most people did not notice it happening. But it had happened. The smartphone in your hand in 2024 was meaningfully heavier and thicker than the smartphone in your hand in 2014.

Samsung's Galaxy S25 standard model, launched in January 2025, measured 7.2 millimetres and weighed 162 grams — not heavy, but not the kind of phone you describe as slim. The S25 Plus was 7.3 millimetres. The S25 Ultra, with its built-in S Pen, was 8.2 millimetres and 218 grams.

The S25 Edge, at 5.8 millimetres and 163 grams, is in a different category. To put those numbers in physical perspective: 5.8 millimetres is roughly the thickness of five credit cards stacked on top of each other. It is, as one reviewer put it, the kind of phone you pick up and then immediately look at again because you cannot quite believe it is a fully functional flagship.

The Launch: May 13 and What Samsung Was Really Saying

The Galaxy S25 Edge was announced on 13 May 2025 and went on sale on 30 May. The pricing landed at $1,099.99 for the base 12GB RAM / 256GB storage model and $1,219.99 for the 512GB version — positioning it neatly between the Galaxy S25+ and the S25 Ultra in Samsung's hierarchy.

That pricing is a statement in itself. This is not a budget-friendly addition to the lineup. It is a premium product, priced as one, aimed at people who are willing to pay for design. And the "Beyond Slim" tagline was Samsung explicitly telling the market: we are changing what premium means.

But the timing mattered just as much as the pricing. The S25 Edge launched amid widely reported speculation that Apple was preparing the iPhone 17 Air — an ultra-thin version of Apple's flagship expected in September 2025. Ben Wood, chief analyst at CCS Insight, described the S25 Edge launch with language that Samsung's marketing team would have approved of: "For the second half of 2025, 'thin is most definitely in'."

He also said something more pointed: "It is hard to believe this is not a pre-emptive strike following the widespread speculation that Apple will have a thin iPhone in its next line-up."

A pre-emptive strike. Samsung, for the first time since 5G became the standard benchmark for premium phones, is setting an agenda rather than responding to one. By launching an ultra-thin flagship four months before Apple's expected release, Samsung gets to define what the category means, what compromises are and are not acceptable, and what the baseline experience should feel like — before Apple gets to say a word about it.

The Specs: What 5.8mm Actually Gets You

Let's go through what is actually inside, because the design achievement only matters if the phone works.

The Processor: The S25 Edge runs the same Snapdragon 8 Elite for Galaxy chipset as the rest of the S25 series. This is not a diluted version of the flagship chip, not a slightly slower variant to save power in a thinner chassis. It is the exact same silicon that powers the S25 Ultra. Day-to-day tasks feel identical: instant app launches, zero lag editing 4K video, fluid 120Hz scrolling. The chip performs identically to its more expensive sibling.

The Display: A 6.7-inch Dynamic AMOLED panel with a 120Hz refresh rate, 3120x1440 resolution, and a screen-to-body ratio of nearly 90%. The display is visually identical to the one on the S25 Plus — which is a compliment, because that screen is excellent. Samsung has protected it with Corning Gorilla Glass Victus 2, and the titanium frame (available in Titanium Icyblue, Titanium Silver, and Titanium Jetblack) brings the same premium material language as the S25 Ultra. IP68 water and dust resistance is included — meaning the decision to make the phone thin did not involve sacrificing the protection that people who spend over $1,000 on a phone reasonably expect.

The Camera: This is where things get genuinely interesting, and also where the first real compromise appears. The S25 Edge carries a 200MP main sensor — the same sensor found on the S25 Ultra, which has one of the best cameras on any smartphone available in 2025. Photos from the main sensor are identical to the Ultra's at 1x, with rich detail and Samsung's trademark punchy colour reproduction. The 12MP ultra-wide is solid for landscapes and group shots.

What you do not get is optical zoom. The S25 Ultra has a dedicated telephoto lens — in fact, it has two. The S25 Edge has a dual camera system: main wide and ultra-wide. Digital crops look good up to 3x, acceptable at 5x, and noticeably degraded beyond that. If you regularly shoot at 10x or beyond — the moon shot crowd, the sports photography crowd — you will miss the telephoto. For everyone else, the dual camera system will cover the overwhelming majority of shooting scenarios with exceptional quality.

The Battery: 3,900mAh. This is the number that generates the most discussion, and it deserves honest treatment. It is smaller than the battery in the S25 Plus (4,900mAh) or the S25 Ultra (5,000mAh), and that is the direct consequence of making the phone 5.8mm thin — physics imposes limits on what can fit inside that chassis. In practice, heavy users report around six hours of screen-on time. For moderate users — phone calls, social media, navigation, some streaming — battery life lasts a full day without stress. For power users who never let a phone dip below 50% without reaching for a charger, the S25 Edge may feel tight.

The charging speed is 25W — a figure that drew criticism from reviewers noting that paying over $1,000 for a phone in 2025 and getting 25W charging feels like a retrograde choice when the standard S25 supports 45W. Samsung's defence is that the battery chemistry required to fit 3,900mAh into 5.8mm necessitated choices about charging architecture. The critique is fair. The counter-argument has engineering merit. Neither fully wins.

Software: One UI 7 on Android 15, with Samsung's Galaxy AI suite fully intact. Real-time Live Translate, Chat Assist, Generative Edit in the Gallery — every AI feature that runs on the S25 Ultra runs identically on the Edge. Samsung has committed to seven years of major Android updates for the device, which at a price point over $1,000 is the minimum you should expect and also something competitors do not always deliver.

The Real-World Feel: What Reviewers Actually Said

Numbers tell part of the story. The part that numbers do not capture is what it actually feels like to use the phone.

Reviewers who spent time with the S25 Edge before launch consistently described a version of the same experience: picking it up for the first time and needing a moment to reconcile what your hand was telling you with what your eyes were seeing. A phone this capable should not feel this light. It should not slide this easily into a jeans pocket. It should not sit in your hand this comfortably.

One reviewer described the design as "addictive" — noting that once you have used a phone this thin for a week, going back to a standard-thickness flagship feels like picking up a brick. This is the sensory recalibration that Samsung was aiming for, and by most accounts it achieved it.

The titanium frame was praised universally. It adds structural rigidity that prevents the kind of flex that thinner phones sometimes suffer from, while keeping weight down in a way that steel cannot. The Gorilla Glass Victus 2 front and back means the phone feels premium to the touch in both directions — there is no plastic anywhere.

The in-screen ultrasonic fingerprint sensor worked reliably and quickly in hands-on testing. Face recognition was fast. The hinge-less design — this is not a flip phone, not a foldable — meant reviewers could concentrate purely on the experience of using a very thin, very capable, conventionally-formed smartphone without the added complexity of a folding mechanism.

The Compromises: What You Are Actually Trading

Let's be direct about what the thinness costs, because honest reviews are more useful than marketing.

No telephoto lens. If zoom photography matters to you — really matters, not occasional casual zooms but deliberate long-range shots — the S25 Edge is the wrong phone. The 200MP main sensor is extraordinary, but it does not replace a dedicated telephoto, and anyone who has used the S25 Ultra's zoom capabilities will notice the absence.

The 3,900mAh battery is adequate for most users and genuinely tight for heavy users. The 25W charging speed means topping up from empty takes roughly 75-90 minutes — in an era when some Android phones charge from zero to full in under 30 minutes, that is a noticeable step down.

No S Pen. This is expected — the S Pen requires dedicated housing that cannot coexist with a 5.8mm chassis — but Samsung's stylus ecosystem has built a loyal following among professionals and note-takers who will not find what they need here.

No storage expansion. Like most modern flagships, the S25 Edge has no microSD slot. 256GB or 512GB, and that is what you have.

These are real compromises. They are the engineering reality of what making a phone this thin actually requires. Whether they matter to you depends entirely on how you use your phone — and for the majority of users whose primary use cases are messaging, social media, photography, navigation, and video, the compromises are essentially invisible in daily use.

The Bigger Picture: Samsung Just Started a War

The industry context around the S25 Edge is as interesting as the phone itself.

CCS Insight's Ben Wood was right: thin is in for 2025, and Samsung got there first. Apple's iPhone 17 Air is expected in September 2025 with a sub-6mm thickness and a price point rumoured around $899 — which, if accurate, will undercut the S25 Edge by $200 while potentially matching or exceeding its thinness. Chinese manufacturers including Honor and Xiaomi are not far behind on their own ultra-thin flagships.

What Samsung has bought with the S25 Edge is time and narrative control. For the months between May and September, every review of an ultra-thin phone, every comparison, every "should I buy?" question will be measured against the S25 Edge. Apple will launch the iPhone 17 Air into a market where Samsung has already defined what the category looks like and what compromises it requires.

That is a meaningful advantage — not decisive, but meaningful. The first mover in a new design category sets the vocabulary that everyone else has to use. When the iPhone 17 Air arrives, reviewers will ask how it compares to the S25 Edge. That framing favours Samsung simply by virtue of having been there first.

Who Is This Phone For?

The Galaxy S25 Edge is, in the most honest summary, a statement piece with flagship performance, a world-class main camera, and a design that will make people ask what phone you have.

It is for the person who wants the best Android flagship but finds the S25 Ultra's size and weight excessive for daily carry. It is for the person who photographs people and places but does not need telephoto zoom. It is for the person who charges their phone every night and does not worry about midday battery anxiety. It is for the person who genuinely notices and cares about the physical quality of the object in their hand.

It is not for the zoom photographer, the power user who needs all-day battery regardless of usage, or the productivity professional who relies on the S Pen. Those people have other options in Samsung's lineup and they should use them.

A Final Word

The Galaxy S25 Edge is not the next big thing. It is, as one reviewer precisely described it, the next small thing.

And that framing captures something true about where premium smartphones are heading. The era of "bigger, more, heavier" has crested. What comes next — the era being inaugurated by the S25 Edge and shortly to be continued by the iPhone 17 Air and whatever Xiaomi and Honor bring — is the era of "lighter, thinner, more considered."

At $1,099, the S25 Edge asks you to pay for a design decision rather than a spec sheet. It asks you to value the feeling of a phone disappearing in your hand over the security of a telephoto lens you will use occasionally. It asks you to decide whether "Beyond Slim" is a marketing tagline or an actual priority.

For the people who answer yes — and there are more of them than the industry had recently assumed — Samsung built exactly the right phone at exactly the right moment.