| Brand | Vivo |
| Model | Y91 |
| Release date | January 2019 |
| Launched in India | Yes |
| Form factor | Touchscreen |
| Dimensions (mm) | 155.11 x 75.09 x 8.28 |
| Weight (g) | 163.50 |
| Battery capacity (mAh) | 4030 |
| Colours | Ocean Blue, Starry Black |
| Screen size (inches) | 6.22 |
| Touchscreen | Yes |
| Resolution | 720×1520 pixels |
| Processor | octa-core |
| Processor make | MediaTek Helio P22 (MT6762R) |
| RAM | 2GB |
| Internal storage | 32GB |
| Expandable storage | Yes |
| Expandable storage type | microSD |
| Expandable storage up to (GB) | 256 |
| Dedicated microSD slot | Yes |
| Rear camera | 13-megapixel (f/f/2.2) + 2-megapixel (f/f/2.4) |
| Rear flash | LED |
| Front camera | 8-megapixel (f/f/1.8) |
| Front flash | No |
| Operating system | Android 8.1 |
| Skin | Funtouch OS 4.5 |
| Wi-Fi | Yes |
| Bluetooth | Yes, v 5.00 |
| NFC | No |
| Micro-USB | Yes |
| Headphones | 3.5mm |
| Number of SIMs | 2 |
| Active 4G on both SIM cards | Yes |
| SIM 1 | |
| SIM Type | Nano-SIM |
| GSM/CDMA | GSM |
| 3G | Yes |
| 4G/ LTE | Yes |
| Supports 4G in India (Band 40) | Yes |
| SIM 2 | |
| SIM Type | Nano-SIM |
| GSM/CDMA | GSM |
| 3G | Yes |
| 4G/ LTE | Yes |
| Supports 4G in India (Band 40) | Yes |
| Face unlock | Yes |
| Fingerprint sensor | Yes |
| Compass/ Magnetometer | Yes |
| Proximity sensor | Yes |
| Accelerometer | Yes |
| Ambient light sensor | Yes |
| Gyroscope | Yes |
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