| Hardware and OS | Karbonn A21 Plus | |
| Operating System | Android v4.2 (Jelly Bean) | |
| Processor | Dual core, 1 GHz | |
| Internal Memory | 4 GB | |
| External memory | Yes, Up to 32 GB | |
| RAM | 512 MB | |
| Display | Karbonn A21 Plus | other phones |
| Type | TFT | |
| Size | 5 inches (12.7 cm) | |
| PPI /points per inch/ | 196 ppi | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | |
| Connectivity | Karbonn A21 Plus | other phones |
| 3G Bands | UMTS 2100 MHz | |
| Network Support | 3G, 2G | |
| SIM Slot(s) | Dual SIM, GSM GSM | |
| Bluetooth | Yes | |
| Wi-Fi | Yes, Wi-Fi 802.11, b/g/n | |
| Camera | Karbonn A21 Plus | other phones |
| Main camera | 5 MP, Primary Camera, | |
| Camera Setup | Single | |
| Autofocus | Yes | |
| Camera Features | Digital Zoom | |
| Flash | Yes, LED Flash | |
| Image Resolution | 2592 x 1944 Pixels | |
| Selfie camera | 0.3 MP, Primary Camera, | |
| Multimedia | Karbonn A21 Plus | other phones |
| Headphone jack | 3.5 mm | |
| FM Radio | Yes | |
| Loudspeaker | Yes | |
| Design | Karbonn A21 Plus | other phones |
| Colours | Black, White | |
| Width | 60.5 mm | |
| Height | 112 mm | |
| Thickness | 11.5 mm | |
| Weight | 104 grams | |
| Battery | Karbonn A21 Plus | other phones |
| Capacity | 2000 mAh | |
| Type | Li-ion | |
| Other features | Karbonn A21 Plus | other phones |
| Other Sensors | Light sensor, Proximity sensor, Accelerometer | |
