| Manufacture | Nokia | Nokia |
| Model | N81 | 6151 |
| Form factor | Slider | Block |
| Weight | 140 gram | 98.00 |
| Dimensions (HxWxD) | 102 x 50 x 18 | 108.00 x 47.00 x 19.00 |
| Operating System | Other | Series 40 |
| Networks | 2G - 850/900/1800/1900
3G - 2100 | 2G - 900/1800/1900
|
| HSCSD |  | |
| GPRS |  | |
| EDGE | | |
| UMTS | | |
| HSDPA | | |
| HSPA+ | | |
| WiMAX | | |
| LTE (4G light) | | |
| WLAN / Wi-Fi | | |
| Wi-Fi Hotspot | | |
| Wi-Fi Direct | | |
| SMS | | |
| MMS | | |
| Email | | |
| HDMI out | | |
| USB port | | |
| MHL | | |
| Bluetooth | | |
| Bluetooth version | NA | NA |
| DLNA | | |
| GPS | | |
| Glonass | | |
| ANT+ | | |
| IrDA | | |
| NFC | | |
| 3.5 mm audio connector | | |
| Camera | | |
| Camera resolution | 2 Megapixels, 20x digital zoom | 1.3 Megapixels. 4x digital zoom |
| Image Stabilization | | |
| BSI sensor | | |
| Camera Flash/Light | | |
| Flash type | NA | NA |
| Video recording | | |
| Video capture resolution | NA | NA |
| Second Camera | NA | NA |
| Display size | 2.4 inches | 1.80 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | 16700000 | 262144 |
| Display width | 240 | 128 |
| Display height | 320 | 160 |
| PPI | 166.67 | 113.83 |
| Second Display | NA | NA |
| CPU | NA | NA |
| GPU | NA | NA |
| Memory | 18MB. Expandable up to 4GB with miniSD card | 30 MB expandable with microSD card |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | MP3, AAC, eAAC+, AAC+, WMA, WAV | Polyphonic, MP3, M4A, and eAAC+ |
| Java | | |
| Games | Space Impact Light, Asphalt demo, Fifa Soccer 2007 demo | Preinstalled in Europe, Africa and Middle Esato only: Golf Tour |
| FM Radio | | |
| Battery | 1050 mAh | Li-Polymer 970 mAh |
| Standby time (h) | 408 | 340 |
| Talktime (m) | 240 | 270 |
| Wireless Charging | | |
| Browser | 2.0 XHTML | 2.0 XHTML |
| Calendar | | |
| Voicedialing | | |
| IP Code | NA | NA |
| Predictive text | | |
| RSS reader | | |
| Voicememo | | |
| PC Synchronization | | |
| SyncML | | |
| Website | Website | Website |
