Comparison between:
- Samsung Galaxy A30s
- Samsung Galaxy A31
- Samsung Galaxy A51
- Xiaomi Mi A2
Brand and model
Information about the brand, model and model alias (if any) of a specific device.
| Samsung Galaxy A30s | Samsung Galaxy A31 | Samsung Galaxy A51 | Xiaomi Mi A2 | |
 Prices |  Prices |  Prices |  Prices | |
| Model alias | SM-A307FN A307FN | SM-A315F | SM-A515F/DS SM-A515F/DSN SM-A515FN/DS SM-A515GN/DS SM-A515FM/DS SM-A515YN SM-A515W | - |
Design
Information about the dimensions and weight of the device, shown in different measurement units. Body materials, available colors, certifications.
| Width | 74.7 mm 7.47 cm 0.245 ft 2.941 in | 73.1 mm 7.31 cm 0.24 ft 2.878 in | 73.6 mm 7.36 cm 0.241 ft 2.898 in | 75.4 mm 7.54 cm 0.247 ft 2.969 in |
| Height | 158.5 mm 15.85 cm 0.52 ft 6.24 in | 159.3 mm 15.93 cm 0.523 ft 6.272 in | 158.5 mm 15.85 cm 0.52 ft 6.24 in | 158.7 mm 15.87 cm 0.521 ft 6.248 in |
| Thickness | 7.8 mm 0.78 cm 0.026 ft 0.307 in | 8.6 mm 0.86 cm 0.028 ft 0.339 in | 7.9 mm 0.79 cm 0.026 ft 0.311 in | 7.3 mm 0.73 cm 0.024 ft 0.287 in |
| Weight | 166 g 0.37 lbs 5.86 oz | 185 g 0.41 lbs 6.53 oz | 172 g 0.38 lbs 6.07 oz | 168 g 0.37 lbs 5.93 oz |
| Volume | 92.35 cm³ 5.61 in³ | 100.15 cm³ 6.08 in³ | 92.16 cm³ 5.6 in³ | 87.35 cm³ 5.3 in³ |
| Colors | Prism Crush Black Prism Crush White Prism Crush Violet Prism Crush Green | 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 Blue Gold |
| Body materials | Plastic | Plastic | Plastic | Aluminium alloy |
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 | Nano-SIM |
| Number of SIM cards | 2 | 2 | 2 | 2 |
| 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 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) |
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 (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 |
| 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 (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 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 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-TDD 2300 MHz (B40) LTE-TDD 2600 MHz (B38) |
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 10 | UMTS EDGE GPRS HSPA+ LTE Cat 12 | UMTS EDGE GPRS HSPA+ LTE Cat 12 |
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 9.0 Pie | Android 10 | Android 10 | Android 8.1 Oreo Android 9.0 Pie |
| User interface (UI) | One UI 1.1 | One UI 2.0 | One UI 2.0 | - |
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 | Samsung Exynos 7 Octa 7904 | MediaTek Helio G70 | Samsung Exynos 7 Octa 9611 | Qualcomm Snapdragon 660 MSM8976 Plus |
| Process technology | 14 nm | 12 nm | 10 nm | 14 nm |
| CPU | 2x 1.8 GHz ARM Cortex-A73, 6x 1.6 GHz ARM Cortex-A53 | 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 2.2 GHz Kryo 260, 4x 1.84 GHz Kryo 260 |
| CPU bits | 64 bit | 64 bit | 64 bit | 64 bit |
| Instruction set | ARMv8-A | ARMv8-A | ARMv8-A | ARMv8 |
| CPU cores | 8 | 8 | 8 | 8 |
| CPU frequency | 1800 MHz | 2000 MHz | 2300 MHz | 2200 MHz |
| GPU | ARM Mali-G71 MP2 | ARM Mali-G52 2EEMC2 | ARM Mali-G72 MP3 | Qualcomm Adreno 512 |
| GPU cores | 2 | - | 3 | - |
| GPU frequency | - | 820 MHz | - | 650 MHz |
| RAM capacity | 4 GB | 4 GB 6 GB | 4 GB 6 GB 8 GB | 4 GB 6 GB |
| RAM type | LPDDR4X | LPDDR4X | LPDDR4X | LPDDR4X |
| RAM channels | Double channel | Double channel | Double channel | Double channel |
| RAM frequency | - | - | - | 1866 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 | 32 GB 64 GB 128 GB |
| eMMC 5.1 | eMMC 5.1 | - | eMMC 5.1 |
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 | IPS |
| Diagonal size | 6.4 in 162.56 mm 16.26 cm | 6.4 in 162.56 mm 16.26 cm | 6.5 in 165.1 mm 16.51 cm | 5.99 in 152.15 mm 15.21 cm |
| Width | 2.68 in 68.12 mm 6.81 cm | 2.63 in 66.71 mm 6.67 cm | 2.67 in 67.75 mm 6.78 cm | 2.68 in 68.04 mm 6.8 cm |
| Height | 5.81 in 147.6 mm 14.76 cm | 5.84 in 148.24 mm 14.82 cm | 5.93 in 150.56 mm 15.06 cm | 5.36 in 136.08 mm 13.61 cm |
| Aspect ratio | 2.167:1 | 2.222:1 | 2.222:1 | 2:1 2:1 (18:9) |
| Resolution | 720 x 1560 pixels | 1080 x 2400 pixels | 1080 x 2400 pixels | 1080 x 2160 pixels |
| Pixel density | 268 ppi 105 ppcm | 411 ppi 161 ppcm | 405 ppi 159 ppcm | 403 ppi 158 ppcm |
| Color depth | 24 bit 16777216 colors | 24 bit 16777216 colors | 24 bit 16777216 colors | 24 bit 16777216 colors |
| Display area | 85.2 % | 85.2 % | 87.72 % | 77.63 % |
| Other features | Capacitive Multi-touch Scratch resistant | Capacitive Multi-touch Scratch resistant | Capacitive Multi-touch Scratch resistant | Capacitive Multi-touch Scratch resistant |
| Infinity-V Display 2.5D curved glass screen | Infinity-U Display 2.5D curved glass screen | - | Corning Gorilla Glass 5 2.5D curved glass screen LTPS (Low Temperature PolySilicon) 1500:1 contrast ratio 500 cd/m² 85% NTSC |
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 Hall | Proximity Light Accelerometer Compass Gyroscope Fingerprint | Proximity Light Accelerometer Compass Gyroscope Barometer Fingerprint Hall |
| In-display fingerprint sensor | In-display fingerprint sensor | In-display fingerprint sensor | Fingerprint sensor model - Fingerprint Cards FPC1028 |
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 S5K2X5 | - | Samsung S5KGM2 | Sony IMX486 Exmor RS |
| Sensor type | ISOCELL | - | ISOCELL | CMOS |
| Sensor format | 1/2.8" | - | 1/2.25" | 1/2.9" |
| Pixel size | 0.9 µm 0.000900 mm | 0.8 µm 0.000800 mm | 0.8 µm 0.000800 mm | 1.25 µm 0.001250 mm |
| ISO | 100 - 800 | - | - | - |
| Aperture | f/1.7 | f/2 | f/2 | f/1.75 |
| Focal length and 35 mm equivalent | - | - | - | 4.07 mm |
| Number of lenses | - | - | 6 | - |
| Flash type | LED | LED | LED | Dual LED |
| Image resolution | 5760 x 4320 pixels 24.88 MP | 8000 x 6000 pixels 48 MP | 8000 x 6000 pixels 48 MP | 4000 x 3000 pixels 12 MP |
| Video resolution | 1920 x 1080 pixels 2.07 MP | 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 | 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 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 Geotagging Panorama HDR Touch focus Face detection White balance settings ISO settings Exposure compensation Self-timer Scene mode Phase detection autofocus (PDAF) |
| CAF Secondary rear camera - 5 MP (depth-sensing) Third rear camera - 8MP (ultra-wide) | 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) | 720p @ 120 fps Secondary rear camera - 20 MP Sensor model - Sony IMX376 Exmor RS (#2) Sensor type - CMOS BSI (#2) Sensor size - 1/2.78" (#2) Pixel size - 2.0 μm (4-in-1 pixel binning) (#2) Aperture size - f/1.75 (#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 | Sony IMX376 Exmor RS |
| Sensor type | ISOCELL | - | ISOCELL | CMOS BSI |
| Sensor format | - | - | 1/2.8" | 1/2.78" |
| Pixel size | - | - | 0.8 µm 0.000800 mm | 1 µm 0.001000 mm |
| Aperture | f/2 | f/2.2 | f/2.2 | f/2.2 |
| Focal length and 35 mm equivalent | - | - | - | 3.82 mm |
| Auxiliary light | - | - | - | LED |
| Image resolution | 4608 x 3456 pixels 15.93 MP | 20 MP | 6560 x 4928 pixels 32.33 MP | 5184 x 3880 pixels 20.11 MP |
| Video resolution | 1920 x 1080 pixels 2.07 MP | 1920 x 1080 pixels 2.07 MP | 1920 x 1080 pixels 2.07 MP | 1920 x 1080 pixels 2.07 MP |
| Video FPS | 30 fps | 30 fps | 30 fps | 30 fps |
| Features | - | Face unlock HDR | Face unlock | - |
| - | - | Sensor type - ISOCELL Slim | Pixel size - 2.0 μm (4-in-1 pixel binning) HDR |
Audio
Information about the type of speakers and the audio technologies supported by the device.
| Speaker | Loudspeaker Earpiece | Loudspeaker Earpiece | Loudspeaker Earpiece | Loudspeaker Earpiece |
| - | - | - | Headphone adapter |
Radio
The radio in a mobile device is a built-in FM radio receiver.
| Radio | Yes | 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 | GPS A-GPS GLONASS BeiDou Galileo | GPS A-GPS GLONASS BeiDou |
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 | 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 Wi-Fi Display |
| - | - | - | 2x2 MiMO |
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 | 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 MAP OPP PAN PBAP HOGP | A2DP HID |
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 | USB Type-C |
| Version | 2.0 | 2.0 | 2.0 | 2.0 |
| Features | Charging Mass storage On-The-Go | Charging Mass storage On-The-Go | Charging Mass storage On-The-Go | Charging Host 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 | No |
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 | Computer sync OTA sync Tethering NFC VoLTE ANT+ | Computer sync OTA sync Infrared Tethering VoLTE |
| - | 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 | 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 AMR AMR-WB eAAC+ FLAC M4A MIDI MP3 OGG WMA WAV | AAC AAC+ AC3 AMR eAAC+ FLAC MIDI MP3 OGG WMA WAV |
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 Flash Video H.263 H.264 H.265 MKV MP4 VC-1 VP8 VP9 WebM WMV WMV7 WMV8 Xvid | 3GPP AVI H.263 H.264 H.265 MKV MP4 VC-1 VP8 Xvid |
Battery
The batteries of mobile devices differ in capacity and technology. They provide the electrical charge needed for the functioning of the devices.
| Capacity | 4000 mAh | 5000 mAh | 4000 mAh | 3010 mAh |
| Type | Li-Ion | 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 | 5 V / 2 A |
| Quick charge technology | - | - | - | Qualcomm Quick Charge 3.0 |
| Features | Fast charging Non-removable | Fast charging Non-removable | Fast charging Non-removable | Fast charging Non-removable |
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) | 1.05 W/kg | 0.488 W/kg | 0.369 W/kg | 0.963 W/kg |
| Body SAR (EU) | 1.54 W/kg | 1.68 W/kg | 1.59 W/kg | 0.639 W/kg |
| Head SAR (USA) | - | - | 0.8 W/kg | 1.16 W/kg |
| Body SAR (USA) | - | - | 0.67 W/kg | 0.66 W/kg |
Additional features
Some devices have additional features, different from the standard ones above, but equally important and worth mentioning.
| Additional features | - | - | - | M1804D2SI - SAR (Specific Absorption Rate) India: head - 1.092 W/kg; body - 0.259 W/kg |
| Samsung Galaxy A30s | Samsung Galaxy A31 | Samsung Galaxy A51 | Xiaomi Mi A2 |