| Local Name | Galaxy M31s |
| Technology | GSM / HSPA / LTE |
| 4G Bands | 1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 26, 28, 38, 40, 41, 66 |
| 3G Bands | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 |
| 2G Bands | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A |
| Announced | 2020, July 30 |
| Status | Available. Released 2020, August 06 |
| Dimensions | 159.3 x 74.4 x 9.3 mm (6.27 x 2.93 x 0.37 in) |
| Weight | 203 g (7.16 oz) |
| SIM | Single SIM (Nano-SIM) or Dual SIM (Nano-SIM, dual stand-by) |
| Display Type | Li-Po 6000 mAh, non-removable |
| Screen Size | 6.5 inches, 102.0 cm2 (~86.1% screen-to-body ratio) |
| Resolution | 1080 x 2400 pixels, 20:9 ratio (~405 ppi density) |
| Protection | Corning Gorilla Glass 3 |
| OS | Android 10, upgradable to Android 12, One UI 4.1 |
| Chipset | Exynos 9611 (10nm) |
| CPU | Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53) |
| GPU | Mali-G72 MP3 |
| Card Slot | microSDXC (dedicated slot) |
| Internal Memory | 128GB 6GB RAM, 128GB 8GB RAM | UFS 2.1 |
| Camera Features | HDR |
| Video | 4K@30fps, 1080p@30fps |
| Loudspeaker | Yes |
| 3.5mm Jack | Yes |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| Bluetooth | 5.0, A2DP, LE |
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS |
| NFC | Yes (market/region dependent) |
| Radio | FM radio, RDS, recording |
| USB | USB Type-C 2.0, USB On-The-Go |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, compass |
| Features Summary | Virtual proximity sensing |
| Colors | Mirage Black, Mirage Blue |
