| Local Name | Y91 |
| Additional Information | Also known as vivo Y91i in Philippines |
| Technology | GSM / HSPA / LTE |
| 4G Bands | LTE band 1(2100), 3(1800), 5(850), 40(2300), 41(2500) |
| 3G Bands | HSDPA 850 / 900 / 2100 |
| 2G Bands | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Speed | HSPA 42.2/5.76 Mbps, LTE Cat5 150/75 Mbps |
| Announced | 2018, November |
| Status | Available. Released 2018, November |
| Dimensions | 155.1 x 75.1 x 8.3 mm (6.11 x 2.96 x 0.33 in) |
| Weight | 163.5 g (5.78 oz) |
| SIM | Dual SIM (Nano-SIM, dual stand-by) |
| Display Type | IPS LCD capacitive touchscreen, 16M colors |
| Screen Size | 6.22 inches, 96.6 cm2 (~82.9% screen-to-body ratio) |
| Resolution | 720 x 1520 pixels, 19:9 ratio (~270 ppi density) |
| OS | Android 8.1 (Oreo); Funtouch 4.5 |
| Chipset | Qualcomm SDM439 Snapdragon 439 (12 nm) |
| CPU | Octa-core (2x1.95 GHz Cortex-A53 & 6x1.45 GHz Cortex A53) |
| GPU | Adreno 505 |
| Card Slot | microSD, up to 256 GB |
| Internal Memory | 16GB 2GB RAM, 32GB 2GB RAM, 32GB 3GB RAM |
| Camera Features | LED flash, panorama |
| Loudspeaker | Yes |
| 3.5mm Jack | Yes |
| Sound | Active noise cancellation with dedicated mic |
| WLAN | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| Bluetooth | 4.2, A2DP, LE |
| GPS | Yes, with A-GPS, GLONASS, BDS |
| Radio | FM radio |
| USB | microUSB 2.0, USB On-The-Go |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass |
| Battery | Non-removable Li-Po 4030 mAh battery |
| Colors | Starry Black, Ocean Blue |
