Samsung Galaxy S25 Ultra / Samsung Galaxy S24 (SM-S921B)

Samsung Galaxy S25 Ultra: 12 GB RAM · 256 GB / 512 GB / 1 TB · global 5G version

Samsung Galaxy S24 (SM-S921B): Galaxy S24, global SM-S921B (8 GB / 128 GB, Nano-SIM + eSIM). The US SM-S921U uses a different processor; the Galaxy S24+ and S24 Ultra are separate models.

SpecificationSamsung Galaxy S25 UltraSamsung Galaxy S24 (SM-S921B)
Release year20252024
Announcement23 January 2025 (Seoul time), Galaxy Unpacked

The Samsung Newsroom release is dated 23 January Korea time; the event was 22 January in US time.

Samsung		—
Memory and storage12 GB RAM; 256 GB, 512 GB or 1 TB

Samsung notes memory options may vary by market and usable storage is lower because of preloaded software. There is no card slot.

Samsung		8 GB RAM; 128 GB (about 103.9 GB available)

The series also has 256 and 512 GB and 12 GB RAM configurations; there is no microSD slot.

Samsung
ProcessorSnapdragon 8 Elite for Galaxy (3 nm)

Samsung quotes 40% NPU, 37% CPU and 30% GPU gains over the previous generation. This version is tuned for Galaxy with higher clocks than the standard Snapdragon 8 Elite.

Samsung		10 cores; 3.2 GHz, 2.9 GHz, 2.6 GHz and 1.95 GHz clusters

Samsung notes that the processor varies by market; the US SM-S921U does not use the same chip as this global model.

Samsung
CoolingVapor chamber 40% larger than before; new thermal interface material (TIM)

The vapor chamber spreads heat from the chip into the body, helping clocks hold longer in extended gaming.

Samsung		—
Display6.9-inch QHD+ Dynamic AMOLED 2X; 1–120 Hz adaptive refresh; Vision Booster

The viewable area is smaller than the diagonal because of rounded corners and the camera hole. Refresh that drops to 1 Hz saves power on static content; Vision Booster adjusts tone mapping in bright light.

Samsung		6.2-inch (6.0-inch with rounded corners) Dynamic AMOLED 2X; 2340 × 1080 (FHD+); adaptive 1–120 Hz; Vision Booster

The adaptive refresh rate drops to 1 Hz on static content to save power; Vision Booster adjusts tone and contrast in bright light.

Samsung
Front coverCorning Gorilla Armor 2 anti-reflective glass ceramic

Used on the front only. Corning says it survived drops of up to 2.2 m onto a concrete-like surface in internal lab tests; this is not a durability guarantee for any given phone.

Samsung		—
FrameTitanium

Titanium is used only on the frame, excluding the volume and side keys.

Samsung		—
Rear cameras200 MP wide f/1.7 OIS (85°); 50 MP ultra-wide f/1.9 (120°); 50 MP 5× telephoto f/3.4 OIS (22°); 10 MP 3× telephoto f/2.4 OIS (36°)

Per Samsung, 3× and 5× are optical; 2× and 10× are “optical quality” zoom made by sensor cropping. OIS is optical image stabilisation.

Samsung		50 MP wide (ƒ/1.8, OIS, 85°); 10 MP 3x telephoto (ƒ/2.4, 36°); 12 MP ultra-wide (ƒ/2.2, 120°)

3x optical zoom uses the separate telephoto lens; the 2x option crops the main sensor at optical quality, and digital zoom reaches 30x.

Samsung
Front camera12 MP f/2.2 (80°) Samsung12 MP, ƒ/2.2, 80° Samsung
Video10-bit HDR recording by default; Galaxy Log

Log records a flat profile for colour grading; results depend on the editing workflow. Audio Eraser can reduce layers such as voices, music, wind and crowd separately in videos.

Samsung		8K (7680 × 4320) at 30 fps; slow motion at UHD 120 fps and FHD 240 fps Samsung
Battery and charging5,000 mAh typical (4,855 mAh rated); 45 W wired, about 65% in 30 minutes; Fast Wireless Charging 2.0; Wireless PowerShare

The 45 W adapter is sold separately. Samsung quotes up to 31 hours of video playback. Wireless PowerShare charges earbuds or a watch from the back of the phone.

Samsung		4000 mAh typical (3880 mAh rated); about 50% in 30 minutes with a 25 W adapter and 3 A cable; Fast Wireless Charging 2.0; Wireless PowerShare

Wireless PowerShare lets the back of the phone wirelessly charge small devices such as a watch or earbud case. No adapter is included.

Samsung
SoftwareLaunched with Android 15 and One UI 7; seven OS generations and seven years of security updates

According to Android Central’s one-year report, the phone received One UI 8 (Android 16) ahead of schedule.

Samsung		—
Connectivity5G, LTE; Wi-Fi 7; Bluetooth 5.4

5G/LTE availability depends on market and carrier.

Samsung		5G; Wi-Fi 6E (2.4 + 5 + 6 GHz); Bluetooth 5.3; NFC; USB Type-C (USB 3.2 Gen 1)

The 6 GHz band needs a Wi-Fi 6E router.

Samsung
DurabilityIP68; up to 1.5 m of fresh water for 30 minutes (lab conditions)

Water resistance is not permanent and may diminish over time.

Samsung		IP68 (up to 1.5 m of fresh water for up to 30 minutes) Samsung
Size and weight162.8 × 77.6 × 8.2 mm; 218 g Samsung147.0 × 70.6 × 7.6 mm; 167 g Samsung
ColoursTitanium Silverblue, Titanium Black, Titanium Whitesilver, Titanium Gray; Samsung.com exclusives Titanium Jetblack, Jadegreen, Pinkgold

Colour availability varies by country and carrier.

Samsung		Onyx Black, Marble Grey, Cobalt Violet, Amber Yellow; extra online colours Samsung
Model code—SM-S921B/DS; Nano-SIM + eSIM or dual eSIM Samsung
Rated battery life—Up to 29 hours of video playback; rated for at least 2000 charge cycles; energy efficiency class A

The 2000-cycle figure comes from the EU label, which targets the battery keeping a set share of its capacity over that span.

Samsung
Location and sensors—GPS, GLONASS, BeiDou, Galileo, QZSS; accelerometer, barometer, fingerprint, gyro, geomagnetic, Hall, light and proximity sensors Samsung
Operating system—Shipped with Android 14 and One UI 6.1; seven generations of OS upgrades and seven years of security updates

Samsung’s UK page lists security updates for this model until 31 January 2031; timing can vary by market.

Samsung