Nokia E66
| General | Form Factor | Slider |
| Network | GSM 850 / 900 / 1800 / 1900 / HSDPA 850 / 900 / 1900 / 2100 | |
| Size | 107.5 x 49.5 x 13.6 mm | |
| Weight | 121 g | |
| Battery Type | li-Ion 1000 mAh | |
| Talk Time | 7 h 30 min | |
| Standby Time | 265 h | |
| Display | Display Type | TFT |
| Display Size | 2.4 inches (240 x 320 pixels) | |
| Display Colors | 16 | |
| External display | No | |
| Memory | Internal Memory | 110 MB |
| Card Slot | microSD, up to 8 GB | |
| Camera | Type | 3.15 megapixel (2048 x 1536 pixels) with autofocus |
| Zoom | No | |
| Flash | Yes | |
| Video | Yes, VGA at 15fps | |
| Secondary Camera | Yes | |
| Messaging | SMS | Yes |
| MMS | Yes | |
| EMS | No | |
| IM | Yes | |
| Yes | ||
| Connectivity | GPRS | Yes |
| EDGE | Yes | |
| 3G | Yes | |
| Wi-Fi | Yes | |
| Infrared | Yes | |
| Bluetooth | Yes, v2.0 with A2DP | |
| USB | Yes, microUSB | |
| Features | OS | Symbian OS 9.2, Series 60 v3.1 UI |
| Browser | Yes | |
| Games | Yes | |
| Other | 128 MB SDRAM ARM 11 369 MHz processor Java MIDP 2.0 Built-in GPS receiver A-GPS VoIP Push to talk MP3/AAC/MPEG4 player FM radio |