| Hardware and OS | OPPO A31 2020 | |
| Operating system | Android v9.0 (Pie) | |
| Chipset | MediaTek Helio P35 | |
| Processor | Octa core, 2.3 GHz, Cortex A53 | |
| Graphics | PowerVR GE8320 | |
| RAM | 4 GB | |
| Internal Storage | 64 GB | |
| Expandable memory | Yes Up to 256 GB | |
| Custom UI | ColorOS | |
| Display | OPPO A31 2020 | other phones |
| Type | IPS LCD | |
| Size | 6.5 inches | |
| Resolution | 720 x 1600 pixels | |
| Pixel Density | 270 ppi | |
| Touchscreen | Yes Capacitive Touchscreen, Multi-touch | |
| Protection | Corning Gorilla Glass v3 | |
| Aspect ratio | 20:9 | |
| Screen to body ratio calculated | 82.43 % | |
| Connectivity | OPPO A31 2020 | other phones |
| Network support | 4G , 3G, 2G | |
| WI-FI | Yes Wi-Fi 802.11, a/ac/b/g/n | |
| Gps | Yes with A-GPS, Glonass | |
| Bluetooth | Yes v5.0 | |
| NFC | No | |
| Dual SIM | Dual SIM, GSM GSM | |
| SIM size | SIM1: Nano, SIM2: Nano | |
| USB TYPE-C | No | |
| USB connectivity | Mass storage device, USB charging, microUSB 2.0 | |
| Camera | OPPO A31 2020 | other phones |
| Main camera | 12 MP 2 MP 2 MP | |
| Image | 4000 x 3000 Pixels | |
| Front camera | 8 MP | |
| Camera features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes LED Flash | |
| Autofocus | Yes Phase Detection autofocus | |
| Aperture | F2.0 | |
| Video recording | 1920x1080 @ 30 fps, 1280x720 @ 30 fps | |
| Design | OPPO A31 2020 | other phones |
| Height | 163.9 mm | |
| Width | 75.5 mm | |
| Thickness | 8.3 mm | |
| Weight | 180 grams | |
| Colours | Mystery Black, Fantasy White, Lake Green | |
| Build material | Back: Plastic | |
| Battery | OPPO A31 2020 | other phones |
| Capacity | 4230 mAh | |
| Type | Li-Polymer | |
| User replaceable | No | |
| Other | OPPO A31 2020 | other phones |
| Fingerprint sensor | Yes | |
| Fingerprint sensor position | Rear | |
| Other sensors | Light sensor, Proximity sensor, Accelerometer, Gyroscope | |
