| Hardware and OS | Siemens SX66 | |
| Operating system | Microsoft Windows Mobile 2003 SE PocketPC | |
| Processor | Intel Xscale PXA272 520 MHz | |
| Internal memory | 128 MB RAM | |
| External memory | SDIO/MMC | |
| Display | Siemens SX66 | other phones |
| Type | TFT | |
| Size | 3.5" inc | |
| Resolution | 240 x 320 px | |
| Touchscreen | resistive touchscreen | |
| Screen-to-Body Ratio | 42.7% | |
| Display area | 37.9 cm2 | |
| Display aspect ratio | 4:3 (height:width) | |
| Pixel Density | 114 PPI | |
| Colors | 65K | |
| Other | Downloadable logos | |
| Connectivity | Siemens SX66 | other phones |
| Wi-Fi | Wi-Fi 802.11b | |
| Network | GSM | |
| SIM card | Mini-SIM | |
| Bluetooth | Yes | |
| Edge | No | |
| GPRS | Class 10 | |
| GPS | No | |
| USB | Proprietary | |
| Camera | Siemens SX66 | other phones |
| Multimedia | Siemens SX66 | other phones |
| 3.5 mm Jack | No | |
| Radio | No | |
| Design | Siemens SX66 | other phones |
| Colors | Silver | |
| Dimensions | 125 x 71 x 18 mm | |
| Weight | 210 g | |
| Battery | Siemens SX66 | other phones |
| Battery life | Stand by time- Up to 200 h
Talking time- Up to 4 h
| |
| Other | Siemens SX66 | other phones |
| Release date | 2004, Q4 | |
| Sensors | Infrared port | |
