| Hardware and OS | Karbonn Smart A66 | |
| Operating System | Android v4.4 (KitKat) | |
| Processor | 1.2 GHz, Dual Core Processor | |
| RAM | 256 MB | |
| Internal Memory | 512 MB | |
| Memory Card Slot | Yes, upto 32 GB | |
| Dual Sim | Yes | |
| Sim Type | Dual Sim, GSM GSM | |
| Display | Karbonn Smart A66 | other phones |
| Screen Size | 3.5 inches, 320 x 480 pixels | |
| Display Type | Color LCD screen | |
| Pixel Density | ~165 PPI | |
| Touch Screen | Yes | |
| Display aspect ratio | 3:2 | |
| Connectivity | Karbonn Smart A66 | other phones |
| 3G Network | No | |
| Bluetooth | Yes | |
| EDGE | Yes | |
| GPRS | Yes | |
| GPS | No | |
| USB | Yes | |
| Wifi | Yes, with wifi-hotspot | |
| Camera | Karbonn Smart A66 | other phones |
| Main camera | 3 MP | |
| Flash | Yes, LED | |
| Selfie camera | 0.3 MP | |
| Multimedia | Karbonn Smart A66 | other phones |
| FM Radio | No | |
| Java | Yes, via 3rd party | |
| Battery | Karbonn Smart A66 | other phones |
| Battery capacity | 1100 mAh, Li-ion Battery | |
| Type | Removable Battery | |
