| General | |
| Manufacturer: | BenQ |
| Model: | P31 |
| Year: | 2005 |
| Operating system: | Symbian UIQ 2.1 |
| Measurements | |
| Dimensions (mm): (width x height x thickness) |
52 x 118 x 18 |
| Weight (g): | 150 |
| Processor | |
| Processor Type: | Texas Instruments OMAP 1510 |
| Clock Frequency (MHz): | 144 |
| Memory | |
| Random access memory (RAM) (MB): | 16 |
| Read-only memory (ROM) (MB): | 48 |
| Communications | |
| Phone: | GSM 1800, GSM 1900, GSM 900 |
| Bluetooth: | 1.1 |
| Other: | CSD, GPRS, HSCSD, IrDA |
| Multimedia | |
| Screen Size: | 2.7 |
| Screen Resolution (px): | 208 x 320 |
| Rear camera (Mp): | 1.2 |
| Speaker: | mono |
| Output of earphones: | 2.5 |
| Management and input | |
| Buttons: | touch-sensitive screen, physical buttons, numerical keyboard |
| Extension | |
| Memory Cards: | MMC, SD |
| Connectors: | miniUSB |
| Additionally |