Samsung Galaxy S21 Dual SIM vs Samsung Galaxy S25 Ultra
| Type | Touch | Touch |
| Waterproofness & dust-resistance | IP68 | IP68 |
| Dimensions | 151.70 x 71.20 x 7.90 mm | 162.80 x 77.60 x 8.20 mm |
| Weight | 169.00 g | 218.00 g |
| Display size | 6.20" | 6.90" |
| Display | Color / Dynamic AMOLED 16M colors 120 Hz 1080 x 2400 px (6.20") 424 ppi | Color / Dynamic AMOLED 2X 16,7M colors 120 Hz 1440 x 3120 px (6.90") 498 ppi |
| Display protection | Corning Gorilla Glass Buy screen protector
 | Corning Gorilla Glass Buy screen protector
|
| Additional display |  | |
| Protection of the secondary display | | |
| Playback time (max.) | nd | Video: 31 h (1.3 days) |
| Standard battery | Li-Ion 4000 mAhBuy powerbank
| Li-Po 5000 mAhBuy powerbank
|
| Quick battery charging | Fast Charging | USB Power Delivery 3.0 |
| Wireless battery charging | Qi | WPC |
| Internal memory | 128 GB, 256 GB | 256 GB, 512 GB, 1000 GB |
| End-user memory |  | 219 GB |
| RAM memory | 8 GB | 12 GB, 16 GB |
| Memory cards | | |
| Operating system | Android 11 | Android 15 |
| Interface | One UI 3.1 | One UI 7 |
| Processor | Samsung Exynos 2100 | Qualcomm Snapdragon 8 Elite SM8750-AB |
| Processor clock | 2900 MHz | 4470 MHz |
| GPU | - | Adreno 830 |
| Touchscreen |  | |
| DualSIM | | |
| SIM cards standard | DualSIM(nanoSIM, nanoSIM) | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | dual standby | dual standby |
| Hybrid DualSIM | | |
| Announced | 1Q 2021 | 1Q 2025 |
| Other names | SM-G991B | SM-S938B; SM-S938B/DS; SM-S938E; SM-S938E/DS; SM-S938U; SM-S938U1; SM-S938W; SM-S938N; SM-S9380 |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 850 900 1700 1900 2100 |
| LTE standard | FDD LTE: 2600, 2100, 1900, 1800, 1700, 900, 850, 800, 700 TDD LTE: 2600, 2500, 2300, 1900 | FDD LTE: 2600, 2100, 1900, 1800, 1700, 1500, 900, 850, 800, 700 TDD LTE: 2600, 2500, 2300, 1900 |
| Standard 5G | FDD 5G: 1900, 1700, 850, 600 TDD 5G: 2500 | FDD 5G: 2600, 2100, 1900, 1800, 1700, 900, 850, 800, 700 TDD 5G: 3700, 3500, 2600, 2500, 2300, 1500 |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | Standard | Standard |
| Photo sensor model | Sony IMX555 | Samsung S5KHP2 |
| Photo matrix | 12 Mpx | 200 Mpx |
| Sensor size | 1/1,98 | 1/1,3 |
| Pixel size | 1,8 µm | 0,6 µm |
| Resolution | 4032x3024 px | 16384x12288 px |
| Optical zoom | | |
| Digital zoom | 30x | 100x |
| Lossless zoom | 3x | |
| Field of view | 79 ° | |
| Focal length | | 24 mm |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | 7680x4320 px | 7680x4320 px |
| Video formats | H.264, H.265, MPEG4 - 24 fps | H.264, H.265, MPEG4 - 30 fps |
| Additional | AF, OIS, f/1.8 | AF, Laser AF, OIS, f/1.7 |
| Second camera | | |
| Camera type | Wide-angle | Wide-angle |
| Photo sensor model | Sony IMX563 | Samsung S5KJN3 |
| Photo matrix | 12 Mpx | 50 Mpx |
| Sensor size | 1/2,55 | 1/1,57 |
| Pixel size | 1,4 µm | 1 µm |
| Resolution | 4032x3024 px | 8160x6144 px |
| Optical zoom | | |
| Field of view | 120 ° | 120 ° |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video formats | H.264, H.265, MPEG4 - 24 fps | |
| Additional | FF, f/2.2 | AF, Laser AF, f/1.9 |
| Third camera | | |
| Camera type | Telephoto | Telephoto |
| Photo sensor model | Samsung S5KGW2 | Sony IMX754 |
| Photo matrix | 64 Mpx | 10 Mpx |
| Sensor size | 1/1,72 | 1/3,52 |
| Pixel size | 0,8 µm | 1,12 µm |
| Resolution | 9280x6944 px | 3648x2736 px |
| Optical zoom | | |
| Lossless zoom | 3x | 3x |
| Field of view | 76 ° | 36 ° |
| Focal length | | 67 mm |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video formats | H.264, H.265, MPEG4 - 24 fps | |
| Additional | AF, OIS, f/2.0 | AF, Laser AF, OIS, f/2.4 |
| Fourth camera | | |
| Camera type | nd | Telephoto |
| Photo sensor model | nd | Sony IMX854 |
| Photo matrix | nd | 50 Mpx |
| Sensor size | nd | 1/2,52 |
| Pixel size | nd | 0,7 µm |
| Optical zoom | nd | |
| Digital zoom | nd | 100x |
| Lossless zoom | nd | 5x |
| Focal length | nd | 111 mm |
| Flash | nd | |
| Dual-colour LED flash | nd | |
| Additional | nd | AF, f/3.4 |
CAMERAS - FRONT
| First camera | | |
| Camera type | Portrait | Portrait |
| Photo sensor model | Sony IMX374 | Samsung S5K3LU |
| Photo matrix | 10 Mpx | 12 Mpx |
| Sensor size | 1/3,2 | 1/3,2 |
| Pixel size | 1,22 µm | 1,12 µm |
| Resolution | 3648x2736 px | 4000x3000 px |
| Optical zoom | | |
| Field of view | 80 ° | |
| Focal length | | 26 mm |
| Flash | | |
| Dual-colour LED flash | | |
| Video resolution | 3840x2160 px | |
| Video formats | H.264, H.265, MPEG4 - 24 fps | |
| Additional | AF, f/2.2 | AF, f/2.2 |
SENSORS
| Accelerometer | | |
| Proximity | | |
| Light | | |
| Magnetometer | | |
| Gyroscope | | |
| Barometer | | |
| Altimeter | | |
| Gravity | | |
| Hall-effect | | |
| Iris scanner | | |
| Fingerprint scanner | | |
| Thermometer | | |
| Hygrometer | | |
Data transfer
| xHTML | | |
| WAP | v2.0 | v2.0 |
| HSCSD | | |
| HSDPA | 42.20 Mbit/s | 42.20 Mbit/s |
| HSUPA | 5.76 Mbit/s | 11.52 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | 2000.00 Mbit/s | |
| LTE UP | 200.00 Mbit/s | |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | v5.1 | v5.4 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/b/g/n/ac/ax | v802.11 a/b/g/n/ac/ax/be |
| WiFi frequencies | 2,4 GHz; 5 GHz | 2,4 GHz; 5 GHz; 6 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v3.2 Type-C | v3.2 Type-C |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| Galileo | | |
| QZSS | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | T9 | T9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | |
| MP3 | | |
| Stereo speakers | 2 | |
| Audio Jack | | |
| HD Voice | | |
| Sound formats | 3GA, AAC, AMR, APE, AWB, DFF, DSF, FLAC, IMY, M4A, MID, MIDI, MXMF, OGA, OGG, OTA, RTTTL, RTX, WAV, WMA, XMF | 3GA, AAC, AMR, APE, AWB, DFF, DSF, FLAC, IMY, M4A, MID, MIDI, MXMF, OGA, OGG, OTA, RTTTL, RTX, WAV, XMF |
| Polyphony | | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | ART | ART |
| Videophone | | |
| DVB-H television | | |
| TV-Out | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Currency converter | | |
| Organizer | | |
| Calendar | | |
| Flight mode | | |
| SyncML | | |
| Data and fax | | |
| Screensaver | | |
| Themes | | |
| Interchangeable covers | | |
| Voice dial | | |
| Speakerphone | | |
| Recorder | | |
| Vibrations | | |
