| Hardware and OS | Oppo A55 | |
| Operating system | Android 11, ColorOS 11.1 | |
| Processor | Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53) | |
| Chipset | MediaTek MT6765G Helio G35 (12 nm) | |
| Internal memory | 64GB 4GB RAM, 128GB 6GB RAM | |
| External memory | microSDXC (dedicated slot) | |
| GPU | PowerVR GE8320 | |
| Display | Oppo A55 | other phones |
| Size | 6.51 inches, 102.3 cm2 | |
| Resolution | 720 x 1600 pixels, 20:9 ratio | |
| Type | IPS LCD, 480 nits (typ), 550 nits (peak) | |
| Protection | NEG T2X-1 | |
| Main Camera | Oppo A55 | other phones |
| Camera | 50 MP, f/1.8 26mm (wide), PDAF
2 MP, f/2.4, (macro)
2 MP, f/2.4, (depth) | |
| Features | LED flash, HDR, panorama | |
| Video | 1080p@30fps | |
| Selfie camera | Oppo A55 | other phones |
| Camera | 16 MP, f/2.0, 26mm (wide) | |
| Features | HDR | |
| Video | 1080p@30fps | |
| Connectivity | Oppo A55 | other phones |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | |
| 3G Network | HSDPA 850 / 900 / 2100 | |
| 4G Network | 1, 3, 5, 8, 38, 40, 41 | |
| Bluetooth | 5.0, A2DP, LE, aptX | |
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS, QZSS | |
| NFC | No | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A | |
| Technology | GSM / HSPA / LTE | |
| USB | USB Type-C 2.0, USB On-The-Go | |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| Multimedia | Oppo A55 | other phones |
| 3.5 mm Jack | Yes | |
| Loudspeaker | Yes | |
| Radio | No | |
| Battery | Oppo A55 | other phones |
| Type | Li-Po 5000 mAh, non-removable | |
| Charging | Fast charging 18W | |
| Design | Oppo A55 | other phones |
| Body | Splash-proof | |
| Colors | Rainbow Blue, Starry Black, Green | |
| Dimensions | 163.6 x 75.7 x 8.4 mm (6.44 x 2.98 x 0.33 in) | |
| Weight | 193 g (6.81 oz) | |
| SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Features | Oppo A55 | other phones |
| Sensors | Fingerprint (side-mounted), accelerometer, proximity, compass | |
