Phone Comparison - Samsung Galaxy A40 vs Samsung Galaxy A21s vs Samsung Galaxy A51 5G UW
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| Manufacturer | Samsung | Samsung | Samsung |
| Announced | March 2019 | Expected Announcement - May 2020 | August 2020 |
| Status | Coming Soon - April 2019 | Rumored | Available - August 2020 |
| Colors | Black, White, Blue, Coral | Black, White, Blue | Prism Bricks Blue |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
144.3 x 69.1 x 7.9 mm (5.68 x 2.72 x 0.31 in) |
8.9 mm thickness (0.35 in thickness) |
158.8 x 73.4 x 8.6 mm (6.25 x 2.89 x 0.34 in) |
| Weight | - | 191 g (6.74 oz) | 188.8 g (6.63.0.28 oz) |
| SIM Type | Single SIM (Nano-SIM), Dual SIM (Nano-SIM, dual stand-by) | Single SIM (Nano-SIM), Dual SIM (Nano-SIM, dual stand-by) | Pre-installed Nano-SIM |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) | GSM 850 / 900 / 1800 / 1900 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 20(800), 38(2600), 40(2300), 41(2500) | LTE | 2, 4, 5, 13, 66 |
| 5G Network | - | - | 260, 261 mmWave |
| SAR EU |
- W/kg (head) - W/kg (body) |
- W/kg (head) - W/kg (body) |
0.59 W/kg (head) 1.32 W/kg (body) |
| Messaging | |||
| Build Features | - Fingerprint Sensor |
- Fingerprint Sensor |
- Fingerprint Sensor (under display, optical) |
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| OS | Android 9.0 (Pie) | Android 10.0 | Android 10 |
| User Interface | - | One UI 2.0 | One UI 2.0 |
| Processor | Octa-core (2x1.8 GHz Cortex-A73 & 6x1.6 GHz Cortex-A53), Exynos 7885 Octa (14 nm) | Octa-core 2.0 GHz, Exynos 850 | Octa-core (1x2.4 GHz Kryo 475 Prime & 1x2.2 GHz Kryo 475 Gold & 6x1.8 GHz Kryo 475 Silver), Qualcomm SDM765 Snapdragon 765G (7 nm) |
| GPU | Mali-G71 | - | Adreno 620 |
| RAM | 4 GB | 3 GB | 6 GB |
| Internal Memory | 64 GB | 64 GB | 128 GB |
| External Memory | microSD, up to 512 GB (dedicated slot) | microSDXC | microSDXC (uses shared SIM slot) |
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| Type | Super AMOLED Capacitive Touchscreen | PLS TFT Capacitive Touchscreen | Super AMOLED Capacitive Touchscreen Corning Gorilla Glass 3 |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.9 inches | 6.55 inches | 6.5 inches |
| Resolution | 1080 x 2280 pixels (428 ppi) | 720 x 1600 pixels (268 ppi) | 1080 x 2400 pixels (405 ppi) |
| Screen-to-Body Ratio | 86.97% | - | 87.47% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio | - | FM radio, RDS, recording |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 16 MP + 5 MP | 48 MP + 8 MP + 2 MP | 48 MP + 12 MP + 5 MP + 5 MP |
| Flash | LED Flash | LED Flash | LED flash |
| Features | 16 MP, f/2.0, PDAF 5 MP, f/2.2, 12mm, (ultrawide) Panorama, HDR |
48 MP, f/2.0, 26mm (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.4, (ultrawide), 1/4.0", 1.12µm 2 MP, f/2.4, (macro) Panorama, HDR |
48 MP, f/2.0, 26mm (wide), 1/2.0", 0.8µm, PDAF 12 MP, f/2.2, 123˚ (ultrawide) 5 MP, f/2.4, (macro) 5 MP, f/2.2, (depth) panorama, HDR |
| Video | 2160p@30fps, 1080p@30fps | 1080p@30fps | 4K@30fps, 1080p@30/120fps; gyro-EIS |
| Front Camera | 25 MP, 1080p@30fps [Similar] |
13 MP, f/2.3, 29mm (normal), 1/3.1", 1.12µm HDR, Panorama 1080p@30fps [Similar] |
32 MP, f/2.0, 26mm (wide), 1/2.8", 0.8µm HDR 1080p@30fps [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat12 600/150 Mbps | HSPA 42.2/5.76 Mbps, LTE-A | HSPA 42.2/5.76 Mbps, LTE-A, 5G |
| Bluetooth | 4.2, A2DP, LE | 5.0, A2DP, LE | 5.0, A2DP, LE |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| USB | Type-C 1.0 reversible connector | Yes | 2.0, Type-C 1.0 reversible connector, USB On-The-Go |
| GPS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS |
| Browser | Yes | Yes | Yes |
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| Internal | 64 GB, 4 GB RAM | 64 GB, 3 GB RAM or 32 GB, 3 GB RAM | 128 GB, 6 GB RAM |
| Expandable Storage | microSD, up to 512 GB (dedicated slot) | microSDXC | microSDXC (uses shared SIM slot) |
| USB OTG | Supported | Supported | Supported |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| Magnetic-Field Sensor (Compass) | |
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| Gyroscope Sensor | |
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| NFC | |
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| Type | Non-removable Li-Po Battery | Non-removable Li-Po Battery Battery Charging 10W |
Non-removable Li-Po Battery Fast battery charging 15W |
| Capacity | 3100 mAh | 5000 mAh | 4500 mAh |
| Stand by | - | - | - |
| Talk Time | - | - | - |
