| Hardware and OS | Karbonn Smart A51 | |
| Operating System | Android v4.0.4 (Ice Cream Sandwich) | |
| Processor | Dual core, 1 GHz | |
| RAM | 256 MB | |
| Internal Memory | 512 MB | |
| Expandable Memory | Yes, Up to 32 GB | |
| Display | Karbonn Smart A51 | other phones |
| Screen Size | 3.5 inches (8.89 cm) | |
| Resolution | 320 x 480 pixels | |
| Display Type | TFT | |
| Pixel Density | 165 ppi | |
| Touch Screen | Yes, Capacitive Touchscreen | |
| Main Camera | Karbonn Smart A51 | other phones |
| Resolution | 3.2 MP Primary Camera
| |
| Image Resolution | 2048 x 1536 Pixels | |
| Flash | Yes, LED Flash | |
| Camera Features | Digital Zoom | |
| Camera Setup | Single | |
| Front Camera | Karbonn Smart A51 | other phones |
| Resolution | 0.3 MP Primary Camera
| |
| Camera Setup | Single | |
| Connectivity | Karbonn Smart A51 | other phones |
| Network | 2G | |
| SIM 1 | 2G Bands: GSM 1800 / 900 MHz
GPRS: Class 12 EDGE: Class 12 | |
| SIM 2 | 2G Bands: GSM 1800 / 900 MHz
| |
| Bluetooth | Yes | |
| Wi-Fi | Yes, Wi-Fi 802.11, b/g | |
| USB Connectivity | microUSB 2.0 | |
| Multimedia | Karbonn Smart A51 | other phones |
| Audio Jack | 3.5 mm | |
| FM Radio | Yes | |
| Design | Karbonn Smart A51 | other phones |
| Height | 132 mm | |
| Width | 67.5 mm | |
| Thickness | 9.25 mm | |
| Colours | Black, White | |
| Battery | Karbonn Smart A51 | other phones |
| Type | Li-ion | |
| Capacity | 1100 mAh | |
| Features | Karbonn Smart A51 | other phones |
| Other Sensors | Accelerometer | |
