Detailed comparison and review of Samsung Galaxy A51 and Ulefone Armor X3. With our comprehensive overview, you can simply compare sizes, functions, but also other key features of both phones and easily decide which one is the right choice for you. Our goal is to help you identify the main differences between products and find the phone that best fits your needs and expectations.
| DESIGN AND DIMENSIONS | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | SM-A515F/DSN | - | |
| Form Factor | Touch | Touch - Rugged | |
| Height | 158.5 mm | 158 mm | Samsung Galaxy A51 has greater height than Ulefone Armor X3. |
| Width | 73.6 mm | 77.5 mm | Ulefone Armor X3 has greater width than Samsung Galaxy A51. |
| Depth | 7.9 mm | 13.85 mm | Samsung Galaxy A51 is narrower than Samsung Galaxy A51. |
| Weight | 172 g | 235 g | Samsung Galaxy A51 is lighter than Samsung Galaxy A51. |
| Body Colour | Silver | Prism crush black | Haze crush silver | Prism crush blue | Prism crush white | Silver | |
| Body Material | - | Aluminium alloy, thermoplastic polyurethane (TPU) | |
| Protection | - | Dustproof, waterproof, drop-proof, splash-resistant | |
| Waterproof (Water-resistant) | - | Yes | Ulefone Armor X3 is waterproof. |
| IP rating | - | IP68, IP69K, IP69 | |
| SAR Value | 0.369 W/kg (head), 1.59 W/kg (body), 2.93 W/kg (limb) | 0.356 W/kg (body), 0.186 W/kg (head) | |
| Connector Type | USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
Headset jack - mini-phone 3.5mm Micro-USB - 5 pin Micro-USB Type B |
|
| SIM Card Type (Size) | Nano SIM | Nano SIM | |
| SIM Card Qty | Dual-SIM | Dual-SIM | |
| SIM Card Configuration Details | - | Nano SIM + nano SIM/microSD |
| DISPLAY | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| Display Type | OLED display | LCD display | |
|---|---|---|---|
| Display Technology | Super AMOLED | IPS | |
| Screen Size (Display Size) | 6.5" | 5.5" | Samsung Galaxy A51 has larger screen size than Ulefone Armor X3. |
| Screen Resolution (Display Resolution) | 2400 x 1080 pixels | 1440 x 720 pixels | Samsung Galaxy A51 has better screen resolution than Ulefone Armor X3. |
| Display Format | Full HD+ | HD+ | |
| Pixel Density | 408 ppi | 293 ppi | Samsung Galaxy A51 has better pixel density than Ulefone Armor X3. |
| Aspect Ratio | - | 18:9 | |
| Colour Depth | 16.7 million colours | - | |
| Display Features | Edge-to-Edge screen, Infinity O display | - |
| PROCESSOR | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| Processor Type (CPU) | Samsung Exynos 9611 | MediaTek | |
|---|---|---|---|
| Processor Number | - | MT6580 | |
| Clock Speed | 2.3 GHz | 1.3 GHz | Samsung Galaxy A51 has higher clock speed than Ulefone Armor X3. |
| Processor Core Qty | 8-core | Quad-core | Samsung Galaxy A51 has higher processor core quantity than Ulefone Armor X3. |
| 64-bit Architecture | Yes | - | Samsung Galaxy A51 has 64-bit architecture. |
| MEMORY | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| RAM | 4 GB | 2 GB | Samsung Galaxy A51 has more RAM than Ulefone Armor X3. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 32 GB | Samsung Galaxy A51 has more internal memory than Ulefone Armor X3. |
| User Memory | 107 GB | - | |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 512 GB | microSDHC, microSDXC - up to 128 GB |
| CAMERA | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 2 | |
|---|---|---|---|
| Sensor Resolution | 48 Megapixel | 8 Megapixel | Samsung Galaxy A51 has better camera resolution than Ulefone Armor X3. |
| Lens Aperture | F/2.0 | F/1.8 | Ulefone Armor X3 has better lens aperture than Samsung Galaxy A51. |
| Lens Construction | - | 5-element | |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | 8x | - | |
| Camera Modes | Slow motion mode, Live Focus mode | Underwater mode | |
| Light Source | LED flash | Dual LED flash | |
| Video Resolutions | Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps | 1920 x 1080 (1080p) | |
| Camera Features (Functions) | AR sticker, background blur, Scene Optimiser, Eye blink, Flaw detection, Stamp, Facial blur | - |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 12 Megapixel | 2 Megapixel | Samsung Galaxy A51 has better second camera resolution than Ulefone Armor X3. |
|---|---|---|---|
| Lens Type (2nd Camera) | Ultra wide-angle lens | - | |
| Lens Aperture (2nd Camera) | F/2.2 | - | |
| Field of View (2nd Camera) | 123 degree(s) | - |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 5 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (3rd Camera) | F/2.4 | - | |
| Camera Functions (3rd Camera) | Macro camera | - |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 5 Megapixel | - | |
|---|---|---|---|
| Lens Type (4th Camera) | Telephoto lens | - | |
| Lens Aperture (4th Camera) | F/2.2 | - | |
| Camera Functions (4th Camera) | Depth camera | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 32 Megapixel | 5 Megapixel | Samsung Galaxy A51 has better front camera resolution than Ulefone Armor X3. |
| Lens Aperture (Front) | F/2.2 | F/2.0 | Ulefone Armor X3 has better front lens aperture than Samsung Galaxy A51. |
| Lens Element Qty (Front) | - | 4-element | |
| Focus Adjustment | Focus free | - |
| BATTERY AND CHARGING | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| Battery Capacity (Battery Size) | 4000 mAh | 5000 mAh | Ulefone Armor X3 has larger battery capacity than Samsung Galaxy A51. |
|---|---|---|---|
| Standby Time | - | 440 hours | |
| Talk Time | 1920 minutes | 1500 minutes | Samsung Galaxy A51 has longer battery life when making calls than Ulefone Armor X3. |
| Run Time Details | Active online usage (LTE): up to 15 hrs Active online usage (Wi-Fi): up to 16 hrs Playback (video): up to 20 hrs Playback (audio): up to 87 hrs Talk (4G): up to 1920 min |
Talk: up to 1500 min Standby: up to 440 hrs Playback (Music): up to 34 hrs Playback (video): up to 9 hrs |
|
| Battery Technology | Lithium Ion | Lithium polymer |
| CELLULAR | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 3G | Samsung Galaxy A51 has more advanced generation mobile network. |
| Operating System | Android 10 | Android 9.0 Pie | |
| User Interface | One UI | - | |
| Intelligent Assistant | Bixby | - | |
| Navigation | GPS, GLONASS, BeiDou, Galileo | GPS |
| COMMUNICATIONS | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE | GPRS, EDGE, HSDPA, HSUPA, HSPA+ | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 8 | Band 1, Band 2, Band 4, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 1900, 1700, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 17, Band 20, Band 26, Band 28, Band 38, Band 40, Band 41, Band 66 | - | |
| 4G LTE Frequency | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700c, FDD 700b, FDD 800 DD, FDD 850+, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | - | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac, ANT+ | IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 5.0 LE | Bluetooth 4.0 | |
| Bluetooth Profiles | HFP, HSP, OPP, PAN, A2DP, AVRCP, HID, SAP, PBAP, MAP, HOGP | - | |
| NFC | Yes | - | Samsung Galaxy A51 has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | SMS, MMS |
| MEDIA | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| Supported Digital Audio Standards | WAV, WMA, AAC, AMR, MP3, FLAC, XMF, OGG, MIDI, M4A, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, MID | AAC, AMR, MP3, FLAC | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, FLV, AVI, WMV, ASF, 3GP, M4V, WebM, 3G2, MP4 | MPEG-4, 3GP |
| FEATURES | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | |
|---|---|---|---|
| Sensors | Accelerometer, ambient light sensor, proximity sensor, gyro sensor, hall sensor, geomagnetic sensor | Accelerometer, digital compass, L-sensor, P-sensor | |
| Security Devices | Fingerprint reader (under display) | Face recognition | |
| Additional Phone Features | Fast Charging, Samsung KNOX, Bixby Vision, Game Booster, Bixby Routines | Face Unlock, Glove mode, customised button |
| OTHERS | Samsung Galaxy A51 | Ulefone Armor X3 |
|---|
| Included Accessories | Power adapter | USB cable, power adapter, SIM card removal tool, tempered glass screen protector | |
|---|---|---|---|
| Compliant Standards | - | MIL-STD 810G, IP68, IP69K | |
| Max Depth of Water Resistance | - | 1.5 m | |
| Max Operating Temperature | - | 60 °C | |
| Min Operating Temperature | - | -20 °C |
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