| Hardware and OS | Zen Ultrafone 503 | |
| Operating System | Android v4.2.2 (Jelly Bean) | |
| 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 | Zen Ultrafone 503 | other phones |
| Screen Size | 4 inches, 480 x 800 pixels | |
| Display Type | Color TFT screen | |
| Pixel Density | ~233 PPI | |
| Touch Screen | Yes | |
| Display aspect ratio | 5:3 | |
| Connectivity | Zen Ultrafone 503 | other phones |
| 3G Network | Yes | |
| Bluetooth | Yes | |
| EDGE | Yes | |
| GPRS | Yes | |
| GPS | Yes | |
| USB | Yes | |
| Wifi | Yes, with wifi-hotspot | |
| Camera | Zen Ultrafone 503 | other phones |
| Main camera | 3.2 MP | |
| Selfie camera | 1.3 MP | |
| Multimedia | Zen Ultrafone 503 | other phones |
| Headphone jack | Yes | |
| FM Radio | Yes | |
| Java | Yes, via 3rd party | |
| Design | Zen Ultrafone 503 | other phones |
| Weight | 100 g | |
| Battery | Zen Ultrafone 503 | other phones |
| Battery capacity | 1500 mAh, Li-ion Battery | |
| Type | Removable Battery | |
