| Hardware and OS | Oppo Realme 3i | |
| Operating system | Android 9.0 (Pie), planned upgrade to Android 10.0 | |
| Processor | Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53) | |
| Chipset | Mediatek MT6771 Helio P60 (12 nm) | |
| GPU | Mali-G72 MP3 | |
| Internal memory | 64 GB, 4 GB RAM32 GB, 3 GB RAM | |
| External memory | microSD, up to 256 GB (dedicated slot) | |
| Display | Oppo Realme 3i | other phones |
| Type | IPS LCD | |
| Size | 6.2" inc | |
| Resolution | 720 x 1520 px | |
| Protection | Corning Gorilla Glass (unspecified) | |
| Touchscreen | capacitive touchscreen | |
| Screen-to-Body Ratio | 81.3% | |
| Display area | 95.9 cm2 | |
| Display aspect ratio | 19:9 (height:width) | |
| Pixel Density | 271 PPI | |
| Colors | 16M | |
| Connectivity | Oppo Realme 3i | other phones |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | |
| 3G Network | HSDPA 850 / 900 / 2100 | |
| 4G Network | LTE band 1(2100), 3(1800), 5(850), 8(900), 38(2600), 40(2300), 41(2500) | |
| Wi-Fi | Wi-Fi 802.11 b/g/n, hotspot | |
| Network | GSM / 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 | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat12 600/50 Mbps | |
| USB | microUSB 2.0, USB On-The-Go | |
| Camera | Oppo Realme 3i | other phones |
| Main camera | 13 MP, Dual | |
| Specs | 13 MP, f/1.8, 1/3', 1.12µm, PDAF
-2 MP, depth sensor | |
| Features | LED flash, HDR | |
| Video | 1080p@30fps | |
| Selfie camera | 13 MP, Single | |
| Multimedia | Oppo Realme 3i | other phones |
| 3.5 mm Jack | Yes | |
| Radio | FM radio | |
| Design | Oppo Realme 3i | other phones |
| Colors | Diamond Blue, Diamond Red, Diamond Black | |
| Dimensions | 156.1 x 75.6 x 8.3 mm | |
| Weight | 175 g | |
| Battery | Oppo Realme 3i | other phones |
| Battery capacity | 4230 mAh, Non-removable Li-Po | |
| Other | Oppo Realme 3i | other phones |
| Release date | 2019, July | |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity | |
