| Hardware and OS Oppo A91 |
| Operating system: | Android 9.0 (Pie); ColorOS 6.1 |
| Processor: | Octa-core (4x2.1 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53) |
| Chipset: | Mediatek MT6771V Helio P70 (12nm) |
| GPU: | Mali-G72 MP3 |
| Internal memory: | 128GB 8GB RAM |
| External memory: | microSD, up to 256 GB (dedicated slot) |
| Display Oppo A91 |
| Type: | AMOLED |
| Size: | 6.4" inc |
| Resolution: | 1080 x 2400 px |
| Protection: | Corning Gorilla Glass 5 |
| Touchscreen: | capacitive touchscreen |
| Screen-to-Body Ratio: | 85.5% |
| Display area: | 100.4 cm2 |
| Display aspect ratio: | 20:9 (height:width) |
| Pixel Density: | 408 PPI |
| Colors: | 16M |
| Other: | 430 nits typ. brightness |
| Connectivity Oppo A91 |
| 2G Network: | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network: | HSDPA 850 / 1700(AWS) / 1900 / 2100 |
| 4G Network: | LTE band 1(2100), 3(1800), 4(1700/2100), 5(850), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500) |
| Wi-Fi: | Wi-Fi 802.11 a/b/g/n/ac/ax, dual-band, Wi-Fi Direct, hotspot |
| Network: | GSM / CDMA / HSPA / LTE |
| SIM card: | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth: | 4.2, A2DP, LE |
| Edge: | Yes |
| GPRS: | Yes |
| GPS: | Yes, with A-GPS, GLONASS, BDS |
| Speed: | HSPA 42.2/11.5 Mbps, LTE-A |
| USB: | 2.0, Type-C 1.0 reversible connector, USB On-The-Go |
| Camera Oppo A91 |
| Main camera: | 48 MP,
Quad |
| Specs: | 48 MP, f/1.8, 26mm (wide), 1/2.0", 0.8µm, PDAF
-8 MP, f/2.2, 13mm (ultrawide), 1/4.0", 1.12µm
-2 MP B/W, f/2.4, 1/5.0", 1.75µm
-2 MP, f/2.4, 1/5.0", 1.75µm, depth sensor |
| Features: | LED flash, HDR, panorama |
| Features: | HDR |
| Video: | 1080p@30fps, gyro-EIS |
| Selfie camera: | 16 MP,
Single |
| Specs: | 16 MP, f/2.0, 26mm (wide), 1/3.1', 1.0µm |
| Video: | 1080p@30fps |
| Multimedia Oppo A91 |
| 3.5 mm Jack: | Yes |
| Radio: | FM radio |
| Design Oppo A91 |
| Colors: | Dark Blue, Red, Blue |
| Body build: | Glass front (Gorilla Glass 5), plastic back, plastic frame |
| Dimensions: | 160.2 x 73.3 x 7.9 mm |
| Weight: | 172 g |
| Battery Oppo A91 |
| Battery capacity: | 4025 mAh, Non-removable Li-Po |
| Other Oppo A91 |
| Release date: | 2019, December |
| Sensors: | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass |
