| Hardware and OS | Vivo Y21 | |
| Operating System | Android v5.1 (Lollipop) | |
| Processor | Quad core, 1.3 GHz, Cortex A7 | |
| Chipset | MediaTek MT6580 | |
| Architecture | 32 bit | |
| RAM | 1 GB | |
| Internal Memory | 16 GB | |
| Expandable Memory | yes Up to 128 GB | |
| Graphics | Mali-400 MP | |
| SIM Slot(s) | Dual SIM, GSM GSM | |
| Display | Vivo Y21 | other phones |
| Screen Size | 4.5 inches (11.43 cm) | |
| Screen Resolution | 480 x 854 pixels | |
| Display Type | IPS LCD | |
| Pixel Density | 218 ppi | |
| Screen Protection | No | |
| Touch Screen | yes Capacitive Touchscreen, Multi-touch | |
| Main Camera | Vivo Y21 | other phones |
| Resolution | 5 MP f/2.2 Primary Camera
| |
| Image Resolution | 2592 x 1944 Pixels | |
| Flash | yes LED Flash | |
| Camera Features | Digital Zoom | |
| Autofocus | yes | |
| Optical Image Stabilisation | No | |
| Physical Aperture | F2.2 | |
| Video Recording | 1280x720 @ 30 fps | |
| Front Camera | Vivo Y21 | other phones |
| Resolution | 2 MP f/2.2 Primary Camera
| |
| Flash | No | |
| Autofocus | No | |
| Physical Aperture | F2.2 | |
| Connectivity | Vivo Y21 | other phones |
| Network | 4G: Not Available,
3G: Available, 2G: Available | |
| SIM 1 | 3G Bands: UMTS 2100 / 850 / 900 MHz 2G Bands: GSM 1800 / 1900 / 850 / 900 MHz
GPRS: Available EDGE: Available | |
| SIM 2 | 2G Bands: GSM 1800 / 1900 / 850 / 900 MHz
| |
| SIM Size | SIM1: Micro, SIM2: Micro | |
| Bluetooth | yes v4.0 | |
| GPS | yes with A-GPS | |
| NFC | No | |
| Wi-Fi | yes Wi-Fi 802.11, b/g/n | |
| Wi-Fi Features | Mobile Hotspot | |
| USB Connectivity | Mass storage device, USB charging, microUSB 2.0 | |
| Multimedia | Vivo Y21 | other phones |
| Audio Jack | 3.5 mm | |
| FM Radio | yes | |
| Loudspeaker | yes | |
| Design | Vivo Y21 | other phones |
| Height | 130.7 mm | |
| Width | 66.4 mm | |
| Thickness | 9.2 mm | |
| Weight | 145 grams | |
| Colours | Gold, White | |
| Battery | Vivo Y21 | other phones |
| Type | Li-ion | |
| Capacity | 1900 mAh | |
| User Replaceable | yes | |
| Quick Charging | No | |
| USB Type-C | No | |
| USB OTG Support | yes | |
| Features | Vivo Y21 | other phones |
| Fingerprint Sensor | No | |
| Other Sensors | Proximity sensor, Accelerometer, Compass | |
