Comparison between:
- Samsung Galaxy A31
- Samsung Galaxy A51
- Samsung Galaxy S9+ Exynos
Brand and model
Information about the brand, model and model alias (if any) of a specific device.
| Samsung Galaxy A31 | Samsung Galaxy A51 | Samsung Galaxy S9+ Exynos | |
 Prices |  Prices |  Prices | |
| Model alias | SM-A315F | SM-A515F/DS SM-A515F/DSN SM-A515FN/DS SM-A515GN/DS SM-A515FM/DS SM-A515YN SM-A515W | Galaxy S9 Plus Exynos SM-G965F G965FSM-G965FD G965FD SM-G965N G965N |
Design
Information about the dimensions and weight of the device, shown in different measurement units. Body materials, available colors, certifications.
| Width | 73.1 mm 7.31 cm 0.24 ft 2.878 in | 73.6 mm 7.36 cm 0.241 ft 2.898 in | 73.8 mm 7.38 cm 0.242 ft 2.906 in |
| Height | 159.3 mm 15.93 cm 0.523 ft 6.272 in | 158.5 mm 15.85 cm 0.52 ft 6.24 in | 158.1 mm 15.81 cm 0.519 ft 6.224 in |
| Thickness | 8.6 mm 0.86 cm 0.028 ft 0.339 in | 7.9 mm 0.79 cm 0.026 ft 0.311 in | 8.5 mm 0.85 cm 0.028 ft 0.335 in |
| Weight | 185 g 0.41 lbs 6.53 oz | 172 g 0.38 lbs 6.07 oz | 189 g 0.42 lbs 6.67 oz |
| Volume | 100.15 cm³ 6.08 in³ | 92.16 cm³ 5.6 in³ | 99.18 cm³ 6.02 in³ |
| Colors | Prism Crush Black Prism Crush Blue Prism Crush Red Prism Crush White | Prism Crush Blue Prism Crush Black Prism Crush Pink Prism Crush White | Black Lilac Gray Blue Gold Red |
| Body materials | Plastic | Plastic | Glass Aluminium alloy |
| Certification | - | - | IP68 |
SIM card
The Subscriber Identity Module (SIM) is used in mobile devices for storing data authenticating the subscribers of mobile services.
| SIM card type | Nano-SIM | Nano-SIM | Nano-SIM |
| Number of SIM cards | 2 | 2 | 1 |
| Features | Dual SIM stand-by (Both cards are active. When one is busy, the other is not active) | Dual SIM stand-by (Both cards are active. When one is busy, the other is not active) | Dual SIM optional (A variant of the model with two SIM card slots is available) |
Networks
A mobile (cellular) network is a radio system, which allows a large number of mobile devices to communicate with each other.
| GSM | GSM 850 MHz (B5) GSM 900 MHz (B8) GSM 1800 MHz (B3) GSM 1900 MHz (B2) | GSM 850 MHz (B5) GSM 900 MHz (B8) GSM 1800 MHz (B3) GSM 1900 MHz (B2) | GSM 850 MHz GSM 900 MHz GSM 1800 MHz GSM 1900 MHz |
| TD-SCDMA | - | - | TD-SCDMA 1880-1920 MHz TD-SCDMA 2010-2025 MHz |
| UMTS | UMTS 850 MHz (B5) UMTS 900 MHz (B8) UMTS 1900 MHz (B2) UMTS 2100 MHz (B1) | UMTS 850 MHz (B5) UMTS 900 MHz (B8) UMTS 1900 MHz (B2) UMTS 2100 MHz (B1) | UMTS 850 MHz UMTS 900 MHz UMTS 1700/2100 MHz UMTS 1900 MHz UMTS 2100 MHz |
| LTE | LTE-FDD 850 MHz (B5) LTE-FDD 900 MHz (B8) LTE-FDD 1900 MHz (B25) LTE-FDD 2100 MHz (B1) LTE-FDD 2600 MHz (B7) | LTE-FDD 850 MHz (B5) LTE-FDD 900 MHz (B8) LTE-FDD 1800 MHz (B3) LTE-FDD 2100 MHz (B1) LTE-FDD 2600 MHz (B7) | LTE-TDD 1900 MHz (B39) LTE-TDD 2300 MHz (B40) LTE-TDD 2500 MHz (B41) LTE-TDD 2600 MHz (B38) LTE 700 MHz Class 13 LTE 700 MHz Class 17 LTE 800 MHz LTE 850 MHz LTE 900 MHz LTE 1700/2100 MHz LTE 1800 MHz LTE 1900 MHz LTE 2100 MHz LTE 2600 MHz LTE 700 MHz (B12) LTE 700 MHz (B28) |
Mobile network technologies and bandwidth
Communication between devices within mobile networks is realized via various generations of network technologies, which provide different bandwidth.
| Mobile network technologies | UMTS EDGE GPRS HSPA+ LTE Cat 10 | UMTS EDGE GPRS HSPA+ LTE Cat 12 | UMTS EDGE GPRS HSPA+ LTE Cat 18 TD-SCDMA TD-HSDPA |
Operating system
Operating system is the system software, which manages and controls the functioning of the hardware components of the device.
| Operating system (OS) | Android 10 | Android 10 | Android 8.0 Oreo Android 9.0 Pie |
| User interface (UI) | One UI 2.0 | One UI 2.0 | Experience 9.0 One |
System on Chip (SoC)
A system on a chip (SoC) includes into a single chip some of the main hardware components of the mobile device.
| SoC | MediaTek Helio G70 | Samsung Exynos 7 Octa 9611 | Samsung Exynos 9 9810 |
| Process technology | 12 nm | 10 nm | 10 nm |
| CPU | 2x 2.0 GHz Cortex-A75, 6x 1.7 GHz Cortex-A55 | 4x 2.3 GHz ARM Cortex-A73, 4x 1.7 GHz ARM Cortex-A53 | 4x 2.7 GHz Exynos M3 Mongoose, 4x 1.79 GHz ARM Cortex-A55 |
| CPU bits | 64 bit | 64 bit | 64 bit |
| Instruction set | ARMv8-A | ARMv8-A | ARMv8-A |
| Level 3 cache memory (L3) | - | - | 4096 KB 4 MB |
| CPU cores | 8 | 8 | 8 |
| CPU frequency | 2000 MHz | 2300 MHz | 2700 MHz |
| GPU | ARM Mali-G52 2EEMC2 | ARM Mali-G72 MP3 | ARM Mali-G72 MP18 |
| GPU cores | - | 3 | 18 |
| GPU frequency | 820 MHz | - | 572 MHz |
| RAM capacity | 4 GB 6 GB | 4 GB 6 GB 8 GB | 6 GB |
| RAM type | LPDDR4X | LPDDR4X | LPDDR4X |
| RAM channels | Double channel | Double channel | Double channel |
| RAM frequency | - | - | 1794 MHz |
Storage
Every mobile device has a built-in storage (internal memory) with a fixed capacity.
| Storage | 64 GB 128 GB | 64 GB 128 GB | 64 GB 128 GB 256 GB |
| eMMC 5.1 | - | UFS 2.1 |
Memory cards
Memory cards are used in mobile devices for expanding their external storage capacity.
| Types | microSD microSDHC microSDXC | microSD microSDHC microSDXC | microSD microSDHC microSDXC |
Display
The display of a mobile device is characterized by its technology, resolution, pixel density, diagonal length, color depth, etc.
| Type/technology | Super AMOLED | Super AMOLED | Super AMOLED |
| Diagonal size | 6.4 in 162.56 mm 16.26 cm | 6.5 in 165.1 mm 16.51 cm | 6.2 in 157.48 mm 15.75 cm |
| Width | 2.63 in 66.71 mm 6.67 cm | 2.67 in 67.75 mm 6.78 cm | 2.71 in 68.89 mm 6.89 cm |
| Height | 5.84 in 148.24 mm 14.82 cm | 5.93 in 150.56 mm 15.06 cm | 5.58 in 141.61 mm 14.16 cm |
| Aspect ratio | 2.222:1 | 2.222:1 | 2.056:1 |
| Resolution | 1080 x 2400 pixels | 1080 x 2400 pixels | 1440 x 2960 pixels |
| Pixel density | 411 ppi 161 ppcm | 405 ppi 159 ppcm | 531 ppi 208 ppcm |
| Color depth | 24 bit 16777216 colors | 24 bit 16777216 colors | 24 bit 16777216 colors |
| Display area | 85.2 % | 87.72 % | 83.88 % |
| Other features | Capacitive Multi-touch Scratch resistant | Capacitive Multi-touch Scratch resistant | Capacitive Multi-touch Scratch resistant |
| Infinity-U Display 2.5D curved glass screen | - | Corning Gorilla Glass 5 Dual Edge display Always-On Display VR headset support HDR10 |
Sensors
Different sensors measure different physical quantities and convert them into signals recognizable by the mobile device.
| Sensors | Proximity Light Accelerometer Compass Gyroscope Fingerprint Hall | Proximity Light Accelerometer Compass Gyroscope Fingerprint | Proximity Light Accelerometer Compass Gyroscope Barometer Fingerprint Hall Heart rate Iris sensor |
| In-display fingerprint sensor | In-display fingerprint sensor | - |
Rear camera
The primary camera of the mobile device is usually placed on its back and can be combined with one or more additional cameras.
| Sensor model | - | Samsung S5KGM2 | Samsung SAK2L3 |
| Sensor type | - | ISOCELL | ISOCELL |
| Sensor format | - | 1/2.25" | 1/2.55" |
| Pixel size | 0.8 µm 0.000800 mm | 0.8 µm 0.000800 mm | 1.4 µm 0.001400 mm |
| Aperture | f/2 | f/2 | f/1.5 - 2.4 |
| Focal length and 35 mm equivalent | - | - | 4.3 mm 26 mm *(35 mm / full frame) |
| Field of view | - | - | 77 ° |
| Number of lenses | - | 6 | - |
| Flash type | LED | LED | Dual LED |
| Image resolution | 8000 x 6000 pixels 48 MP | 8000 x 6000 pixels 48 MP | 4032 x 3024 pixels 12.19 MP |
| Video resolution | 1920 x 1080 pixels 2.07 MP | 1920 x 1080 pixels 2.07 MP | 3840 x 2160 pixels 8.29 MP |
| Video FPS | 30 fps | 30 fps | 30 fps |
| Features | Autofocus Continuous shooting Digital zoom Geotagging Panorama HDR Touch focus Face detection White balance settings ISO settings Exposure compensation Self-timer Scene mode | Autofocus Continuous shooting Digital zoom Digital image stabilization Geotagging Panorama HDR Touch focus Face detection White balance settings ISO settings Exposure compensation Self-timer Scene mode Phase detection autofocus (PDAF) | Autofocus Continuous shooting Digital zoom Optical zoom Optical image stabilization Geotagging Panorama HDR Touch focus Face detection White balance settings ISO settings Exposure compensation Self-timer Scene mode Phase detection autofocus (PDAF) |
| Secondary rear camera - 8 MP (ultra-wide) Aperture size - f/2.2 (#2) Third rear camera - 5 MP (depth-sensing) Aperture size - f/2.4 (#3) Fourth rear camera - 5 MP (macro) Aperture size - f/2.4 (#4) | Pixel size - 1.6 μm (4-in-1 pixel binning) Sensor type - ISOCELL PLUS Super Phase Detection Secondary rear camera - 12 MP (ultra-wide angle) Aperture size - f/2.2 (#2) Pixel size - 1.12 μm (#2) Third rear camera - 5 MP (macro) Aperture size - f/2.4 (#3) Fourth rear camera - 5 MP (depth-sensing) Aperture size - f/2.2 (#3) Pixel size - 1.12 μm (#3) | Phase detection with Dual Pixel Object tracking AF Smart OIS High CRI LED flash 2160p @ 60 fps 1080p @ 240 fps 720p @ 960 fps Secondary rear camera - 12 MP (telephoto) Pixel size - 1.0 μm (#2) Aperture size - f/2.4 (#2) Focal length (35 mm equivalent) - 52 mm (#2) |
Front camera
Modern smartphones have one or more front cameras and their positioning has led to various design concepts – pop-up camera, rotating camera, notch, punch hole, under-display camera, etc.
| Sensor model | - | Samsung S5KGD1 | Samsung S5K3H1 |
| Sensor type | - | ISOCELL | - |
| Sensor format | - | 1/2.8" | 1/3.6" |
| Pixel size | - | 0.8 µm 0.000800 mm | 1.22 µm 0.001220 mm |
| Aperture | f/2.2 | f/2.2 | f/1.7 |
| Focal length and 35 mm equivalent | - | - | 2.92 mm 25 mm *(35 mm / full frame) |
| Field of view | - | - | 80 ° |
| Image resolution | 20 MP | 6560 x 4928 pixels 32.33 MP | 3264 x 2448 pixels 7.99 MP |
| Video resolution | 1920 x 1080 pixels 2.07 MP | 1920 x 1080 pixels 2.07 MP | 2560 x 1440 pixels 3.69 MP |
| Video FPS | 30 fps | 30 fps | 30 fps |
| Features | Face unlock HDR | Face unlock | - |
| - | Sensor type - ISOCELL Slim | Auto HDR |
Audio
Information about the type of speakers and the audio technologies supported by the device.
| Speaker | Loudspeaker Earpiece | Loudspeaker Earpiece | Loudspeaker Earpiece |
| - | - | 384 kHz / 32-bit Dolby Atmos |
Radio
The radio in a mobile device is a built-in FM radio receiver.
| Radio | Yes | Yes | No |
Tracking/Positioning
Information about the positioning and navigation technologies supported by the device.
| Tracking/Positioning | GPS A-GPS GLONASS BeiDou | GPS A-GPS GLONASS BeiDou Galileo | GPS A-GPS GLONASS BeiDou Galileo |
Wi-Fi
Wi-Fi is a technology that provides wireless data connections between various devices within a short range.
| Wi-Fi | 802.11a 802.11b 802.11g 802.11n 802.11n 5GHz 802.11ac Dual band Wi-Fi Hotspot Wi-Fi Direct | 802.11a 802.11b 802.11g 802.11n 802.11n 5GHz 802.11ac Dual band Wi-Fi Hotspot Wi-Fi Direct Wi-Fi Display | 802.11a 802.11b 802.11g 802.11n 802.11n 5GHz 802.11ac Dual band Wi-Fi Hotspot Wi-Fi Direct |
| - | - | VHT80 MU-MiMO 1024-QAM |
Bluetooth
Bluetooth is a standard for secure wireless data transfer between different types of devices over short distances.
| Version | 5.0 | 5.0 | 5.0 |
| Features | A2DP AVRCP DIP HFP HID HSP MAP OPP PAN PBAP HOGP | A2DP AVRCP DIP HFP HID HSP MAP OPP PAN PBAP HOGP | A2DP AVRCP DIP HFP HID HSP LE MAP OPP PAN PBAP |
USB
The Universal Serial Bus (USB) is an industry standard that allows different electronic devices to exchange data.
| Connector type | USB Type-C | USB Type-C | USB Type-C |
| Version | 2.0 | 2.0 | 3.1 |
| Features | Charging Mass storage On-The-Go | Charging Mass storage On-The-Go | Charging Mass storage On-The-Go |
Headphone jack
The headphone jack is an audio phone connector, a.k.a. an audio jack. The most widely used one in mobile devices is the 3.5 mm headphone jack.
| Headphone jack | Yes | Yes | Yes |
Connectivity
Information about other important connectivity technologies supported by the devices.
| Connectivity | Computer sync OTA sync Tethering NFC VoLTE | Computer sync OTA sync Tethering NFC VoLTE ANT+ | Computer sync OTA sync Tethering NFC ANT+ |
| Availability of Samsung Pay Service (NFC or MST) may vary by country | - | - |
Browser
A web browser is a software application for accessing, fetching, displaying and navigating through information on the World Wide Web.
| Browser | HTML HTML5 CSS 3 | HTML HTML5 CSS 3 | HTML HTML5 CSS 3 |
Audio file formats/codecs
Mobile devices support various audio file formats and codecs, which respectively store and code/decode digital audio data.
| Audio file formats/codecs | AAC AMR AMR-WB eAAC+ FLAC M4A MIDI MP3 OGG WMA WAV | AAC AMR AMR-WB eAAC+ FLAC M4A MIDI MP3 OGG WMA WAV | AAC AAC+ AMR AMR-WB aptX eAAC+ FLAC M4A MIDI MP3 OGG WMA WAV XMF LDAC |
Video file formats/codecs
Mobile devices support various video file formats and codecs, which respectively store and code/decode digital video data.
| Video file formats/codecs | 3GPP 3GPP2 AVI Flash Video H.263 H.264 H.265 MKV MP4 VC-1 VP8 VP9 WebM WMV WMV7 WMV8 Xvid | 3GPP 3GPP2 AVI Flash Video H.263 H.264 H.265 MKV MP4 VC-1 VP8 VP9 WebM WMV WMV7 WMV8 Xvid | 3GPP 3GPP2 AVI DivX Flash Video H.263 H.264 MKV MP4 WebM WMV Xvid ASF |
Battery
The batteries of mobile devices differ in capacity and technology. They provide the electrical charge needed for the functioning of the devices.
| Capacity | 5000 mAh | 4000 mAh | 3500 mAh |
| Type | Li-Ion | Li-Ion | Li-Polymer |
| Charger output power | 5 V / 2 A 9 V / 1.67 A | 5 V / 2 A 9 V / 1.67 A | 5 V / 2 A 9 V / 1.67 A |
| Features | Fast charging Non-removable | Fast charging Non-removable | Wireless charging Fast charging Non-removable |
| - | - | Qi/PMA wireless charging |
Specific Absorption Rate (SAR)
The SAR rating shows the amount of electromagnetic radiation absorbed by the human body when using a mobile device, expressed in W/kg.
| Head SAR (EU) | 0.488 W/kg | 0.369 W/kg | 0.294 W/kg |
| Body SAR (EU) | 1.68 W/kg | 1.59 W/kg | 1.35 W/kg |
| Head SAR (USA) | - | 0.8 W/kg | 0.23 W/kg |
| Body SAR (USA) | - | 0.67 W/kg | 0.58 W/kg |
| Samsung Galaxy A31 | Samsung Galaxy A51 | Samsung Galaxy S9+ Exynos |