| Model | Realme U1 | 
| Release Date | December 2018 | 
| Storage Capacity | 32GB / 64GB eMMC 5.1 (Expandable via microSD up to 256GB) | 
| Color Options | Brave Blue, Fiery Gold, Ambitious Black | 
| Display | 6.3-inch FHD+ IPS LCD, 2340 × 1080 pixels, ~409 ppi, Dewdrop Notch, 60Hz | 
| Processor | MediaTek Helio P70 (12nm), Octa-core (4×2.1 GHz Cortex-A73 & 4×2.0 GHz Cortex-A53) | 
| GPU | Mali-G72 MP3 | 
| RAM | 3GB / 4GB LPDDR4X | 
| Rear Camera | Dual: 13MP (f/2.2) primary + 2MP (f/2.4) depth sensor; LED Flash, HDR, Panorama; Video: 1080p@30fps | 
| Front Camera | 25MP (f/2.0) Sony IMX576; HDR, AI Beauty, Bokeh Mode; Video: 1080p@30fps | 
| Battery | 3500mAh Li-Ion (non-removable); 10W Charging via micro-USB | 
| Operating System | ColorOS 5.2 based on Android 8.1 (Oreo); upgradable to Android 9 (Pie) | 
| SIM | Dual Nano-SIM (Dual Standby) | 
| Connectivity | 4G LTE, Wi-Fi 802.11 b/g/n, Bluetooth 4.2, GPS, micro-USB | 
| Security | Rear Fingerprint Sensor, AI Face Unlock | 
| Audio | Single Bottom-Firing Speaker, 3.5mm Headphone Jack | 
| Dimensions | 157 × 74 × 8 mm | 
| Weight | 168g | 
| Build Material | Glass front, plastic back, plastic frame | 
| Sensors | Accelerometer, Gyroscope, Proximity Sensor, Ambient Light Sensor, Compass | 
| Water & Dust Resistance | No official IP rating | 
| Warranty | 6 Months Seller Warranty | 
| In the Box | Handset, Charger, micro-USB Cable, SIM Eject Tool |