| Hardware and OS | Oppo A31 | |
| Operating system | Android 9.0 (Pie); ColorOS 6.1 | |
| Processor | Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53) | |
| Chipset | Mediatek MT6765V/CB Helio P35 (12nm) | |
| GPU | PowerVR GE8320 | |
| Internal memory | 128GB 4GB RAM | |
| External memory | microSDXC (dedicated slot) | |
| Display | Oppo A31 | other phones |
| Type | IPS LCD | |
| Size | 6.5" inc | |
| Resolution | 720 x 1600 px | |
| Touchscreen | capacitive touchscreen | |
| Screen-to-Body Ratio | 82.4% | |
| Display area | 102.0 cm2 | |
| Display aspect ratio | 20:9 (height:width) | |
| Pixel Density | 270 PPI | |
| Colors | 16M | |
| Other | 480 nits typ. brightness | |
| Connectivity | Oppo A31 | other phones |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | |
| 3G Network | HSDPA 850 / 900 / 2100 | |
| 4G Network | LTE (unspecified) | |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| Network | GSM / HSPA / LTE | |
| SIM card | Dual SIM (Nano-SIM, dual stand-by) | |
| Bluetooth | 5.0, A2DP, LE | |
| Edge | Yes | |
| GPRS | Yes | |
| GPS | Yes, with A-GPS, BDS | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A | |
| USB | microUSB 2.0, USB On-The-Go | |
| Camera | Oppo A31 | other phones |
| Main camera | 12 MP, Triple | |
| Specs | 12 MP, f/1.8, (wide), PDAF
-2 MP, f/2.4, 27mm (macro), 1/5.0', 1.75µm
-2 MP, f/2.4, (depth) | |
| Features | LED flash, HDR, panorama | |
| Video | 1080p@30fps | |
| Selfie camera | 8 MP, Single | |
| Multimedia | Oppo A31 | other phones |
| 3.5 mm Jack | Yes | |
| Radio | FM radio | |
| Design | Oppo A31 | other phones |
| Colors | Fantasy White, Mystery Black | |
| Body build | Glass front, plastic back, plastic frame | |
| Dimensions | 163.9 x 75.5 x 8.3 mm | |
| Weight | 180 g | |
| Battery | Oppo A31 | other phones |
| Battery capacity | 4230 mAh, Non-removable Li-Po | |
| Other | Oppo A31 | other phones |
| Release date | 2020, February 13 | |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass | |
