Samsung Galaxy S21 Ultra vs Samsung Galaxy A25
| Type | Touch | Touch |
| Waterproofness & dust-resistance | IP68 |  |
| Dimensions | 165.10 x 75.60 x 8.90 mm | 161.00 x 76.50 x 8.30 mm |
| Weight | 227.00 g | 197.00 g |
| Display size | 6.80" | 6.50" |
| Display | Color / Dynamic AMOLED 16M colors 120 Hz 1440 x 3200 px (6.80") 516 ppi | Color / Super AMOLED 16,7M colors 120 Hz 1080 x 2340 px (6.50") 396 ppi |
| Display protection | Corning Gorilla Glass Buy screen protector
 |  |
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | | 4G: 2280 min. (38.0 h) |
| Playback time (max.) | nd | Audio: 124 h (5.2 days) Video: 21 h (0.9 days) |
| Internet browsing time (max.) | nd | WiFi: 19 h (0.8 days) 4G: 19 h (0.8 days) |
| Standard battery | Li-Ion 5000 mAhBuy powerbank
| Li-Ion 5000 mAhBuy powerbank
|
| Quick battery charging | Fast Charging |  |
| Wireless battery charging | Qi | |
| Internal memory | 128 GB, 256 GB, 512 GB | 128 GB, 256 GB |
| End-user memory | | 108.3 GB |
| RAM memory | 12 GB | 6 GB, 8 GB |
| Memory cards | up to 1000 GB | microSD, microSDHC, microSDXC up to 2000 GBBuy memory card |
| Operating system | Android 11 | Android 14 |
| Interface | One UI 3.1 | One UI 6.0 |
| Processor | Samsung Exynos 2100 | Samsung Exynos 1280 S5E8825 |
| Processor clock | 2900 MHz | 2400 MHz |
| GPU | - | ARM Mali-G68 @1 GHz |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | SingleSIM(nanoSIM) | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | nd | dual standby |
| Hybrid DualSIM | nd | nanoSIM, microSD |
| Announced | 1Q 2021 | 4Q 2023 |
| Other names | SM-G998 | SM-A256B/DS |
| 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 |
| Standard 5G | FDD 5G: 1900, 1700, 850, 600 TDD 5G: 2500 | FDD 5G: 2600, 2100, 1800, 900, 800, 700 TDD 5G: 3700, 3500, 2600, 2500, 2300 |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | Standard | Standard |
| Photo sensor model | Samsung S5KHM2 | |
| Photo matrix | 108 Mpx | 50 Mpx |
| Sensor size | 1/1,52 | |
| Pixel size | 0,7 µm | |
| Resolution | 12000x9000 px | |
| Optical zoom | | |
| Digital zoom | 100x | 10x |
| Lossless zoom | 10x | |
| Field of view | 83 ° | 80 ° |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | 7680x4320 px | 3840x2160 px |
| Video formats | H.264, H.265, MPEG4 - 24 fps | H.264, H.265, MPEG4 - 30 fps |
| Additional | AF, Laser AF, OIS, f/1.8 | AF, OIS, f/1.8 |
| Second camera | | |
| Camera type | Wide-angle | Wide-angle |
| Photo matrix | 12 Mpx | 8 Mpx |
| Sensor size | 1/2,55 | |
| Pixel size | 1,4 µm | |
| Resolution | 4032x3024 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, Laser AF, f/2.2 | FF, f/2.2 |
| Third camera | | |
| Camera type | Telephoto | Macro |
| Photo sensor model | Samsung S5K3J1 | |
| Photo matrix | 10 Mpx | 2 Mpx |
| Sensor size | 1/3,2 | |
| Pixel size | 1,22 µm | |
| Resolution | 3648x2736 px | |
| Optical zoom | | |
| Lossless zoom | 3x | |
| Field of view | 35 ° | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video formats | H.264, H.265, MPEG4 - 24 fps | |
| Additional | AF, Laser AF, OIS, f/2.4 | FF, f/2.4 |
| Fourth camera | | |
| Camera type | Telephoto | nd |
| Photo sensor model | Samsung S5K3J1 | nd |
| Photo matrix | 10 Mpx | nd |
| Sensor size | 1/3,2 | nd |
| Pixel size | 1,22 µm | nd |
| Resolution | 3648x2736 px | nd |
| Optical zoom | | nd |
| Lossless zoom | 10x | nd |
| Field of view | 10 ° | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.264, H.265, MPEG4 - 24 fps | nd |
| Additional | AF, Laser AF, OIS, f/4.9 | nd |
CAMERAS - FRONT
| First camera | | |
| Camera type | Portrait | Portrait |
| Photo sensor model | Samsung S5KGH1 | |
| Photo matrix | 40 Mpx | 13 Mpx |
| Sensor size | 1/2,65 | |
| Pixel size | 0,7 µm | |
| Resolution | 7968x5480 px | |
| Optical zoom | | |
| Field of view | 80 ° | |
| Flash | | |
| Dual-colour LED flash | | |
| Video resolution | 3840x2160 px | |
| Video formats | H.264, H.265, MPEG4 - 24 fps | |
| Additional | FF, f/2.2 | FF, 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 | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | 2000.00 Mbit/s | 1174.00 Mbit/s |
| LTE UP | 200.00 Mbit/s | 211.00 Mbit/s |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | v5.1 | v5.3 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/b/g/n/ac/ax | v802.11 a/b/g/n/ac |
| WiFi frequencies | 2,4 GHz; 5 GHz | 2,4 GHz; 5 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v3.2 Type-C | v2.0 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 | 2 |
| Audio Jack | | 3.5 mm |
| 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, AWB, 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 | | |