| Hardware and OS | Realme 3i | |
| Operating system | Android 9.0 (Pie); ColorOS 6 | |
| Processor | Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53) | |
| GPU | Mali-G72 MP3 | |
| RAM | 3 GB, 4 GB | |
| Internal Storage | 32 GB, 64 GB | |
| Memory Card Slot | microSD, microSDHC, microSDXC | |
| User Interface | Yes | |
| Display | Realme 3i | other phones |
| Type | IPS | |
| Size | 6.22 inches | |
| Resolution | 720 x 1520 pixels | |
| Colors | 16M | |
| Pixel Density | 270 ppi | |
| Touchscreen | Yes | |
| Protection | Corning Gorilla Glass 3 | |
| Features | Capacitive, Multi-touch, Scratch resistant | |
| Connectivity | Realme 3i | other phones |
| 4G Network | Yes | |
| Wi-Fi | Wi-Fi 802.11 b/g/n, hotspot | |
| GPS | Yes, with A-GPS, GLONASS | |
| NFC | No | |
| USB | microUSB 2.0, USB On-The-Go | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat12 600/50 Mbps | |
| SIM | Nano SIM | |
| Dual SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Wireless Charging | No | |
| Camera | Realme 3i | other phones |
| Main camera | 12.98 MP (megapixels) | |
| Features | LED | |
| Image | 4160 x 3120 pixels | |
| Selfie camera | 12.98 MP (megapixels) | |
| Multimedia | Realme 3i | other phones |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Radio | Yes | |
| Video Playback | Yes | |
| Video Out | Yes | |
| Ring Tones | Yes | |
| 3.5 mm Jack | yes | |
| Design | Realme 3i | other phones |
| Waterproof | No | |
| Battery | Realme 3i | other phones |
| Capacity | 4230 mAh, Li-Polymer | |
| Placement | Non-removable | |
| Other | Realme 3i | other phones |
| Sensors | Proximity, Light, Accelerometer, Compass, Fingerprint | |
