| Hardware and OS | vivo U3 | |
| Operating system | Android 9.0 (Pie); Funtouch 9.0 | |
| Processor | Octa-core (2x2.0 GHz Kryo 460 Gold & 6x1.7 GHz Kryo 460 Silver) | |
| Chipset | Qualcomm SDM675 Snapdragon 675 (11 nm) | |
| GPU | Adreno 612 | |
| Internal memory | 64GB 4GB RAM, 64GB 6GB RAM | |
| External memory | microSD, up to 256 GB | |
| Display | vivo U3 | other phones |
| Type | IPS LCD | |
| Size | 6.53" inc | |
| Resolution | 1080 x 2340 px | |
| Touchscreen | capacitive touchscreen | |
| Screen-to-Body Ratio | 84.4% | |
| Display area | 104.7 cm2 | |
| Display aspect ratio | 19.5:9 (height:width) | |
| Pixel Density | 395 PPI | |
| Colors | 16M | |
| Connectivity | vivo U3 | 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), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500) | |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| Network | GSM / HSPA / LTE | |
| SIM card | Dual SIM (Nano-SIM, dual stand-by) | |
| Bluetooth | 5.0, A2DP, LE, aptX | |
| Edge | Yes | |
| GPRS | Yes | |
| GPS | Yes, with A-GPS, GLONASS, BDS | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A | |
| USB | microUSB 2.0, USB On-The-Go | |
| Camera | vivo U3 | other phones |
| Main camera | 16 MP, Triple | |
| Specs | 16 MP, f/1.8, (wide), PDAF
-8 MP, f/2.2, 13mm (ultrawide)
-2 MP, f/2.4, macro camera | |
| Features | LED flash, HDR, panorama | |
| Video | 2160p@30fps, 1080p@30fps | |
| Selfie camera | 16 MP, Single | |
| Multimedia | vivo U3 | other phones |
| 3.5 mm Jack | Yes | |
| Radio | FM radio | |
| Design | vivo U3 | other phones |
| Colors | Black, Blue, Green | |
| Dimensions | 162.2 x 76.5 x 8.9 mm | |
| Weight | 193 g | |
| Battery | vivo U3 | other phones |
| Battery capacity | 5000 mAh, Non-removable Li-Po | |
| Other | vivo U3 | other phones |
| Release date | 2019, October | |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass | |
