| Manufacture | BenQ-Siemens | Nokia |
| Model | P51 | Lumia 820 |
| Form factor | Block | Block |
| Weight | 170 gram | 160.00 |
| Dimensions (HxWxD) | 122 x 60 x 20 | 123.80 x 68.50 x 9.90 |
| Operating System | Other | Windows Phone 8 |
| Networks | 2G - 900/1800
| 2G - 850/900/1900
3G - 850/900/1900/2100 |
| 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 | 3.1 |
| DLNA | | |
| GPS | | |
| Glonass | | |
| ANT+ | | |
| IrDA | | |
| NFC | | |
| 3.5 mm audio connector | | |
| Camera | | |
| Camera resolution | 1.3 Megapixels | 8 megapixels, 4x digital zoom, 28mm focal length, f/2.2 |
| Image Stabilization | | |
| BSI sensor | | |
| Camera Flash/Light | | |
| Flash type | NA | LED |
| Video recording | | |
| Video capture resolution | NA | 1080p |
| Second Camera | NA | NA |
| Display size | 2.8 inches | 4.30 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | 65536 | 16777216 |
| Display width | 240 | 480 |
| Display height | 320 | 800 |
| PPI | 142.86 | 216.97 |
| Second Display | NA | NA |
| CPU | NA | 1.5 GHz dual-core Snapdragon S4 MSM8960 |
| GPU | NA | Adreno 225 |
| Memory | 128 MB, 128 MB Flash | 1 GB RAM. 8 GB internal storage. Expandable up to 32 GB using microSD card |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | Polyphonic 64 voices | MP3, AAC, AAC, AMR-NB, AMR-WB, WAV, WMA |
| Java | | |
| Games | Yes | Yes |
| FM Radio | | |
| Battery | Li-Ion 1370 mAh | 1650 mAh |
| Standby time (h) | 150 | 330 |
| Talktime (m) | 240 | 840 |
| Wireless Charging | | |
| Browser | 2.0 | Internet Explorer 10 |
| Calendar | | |
| Voicedialing | | |
| IP Code | NA | NA |
| Predictive text | | |
| RSS reader | | |
| Voicememo | | |
| PC Synchronization | | |
| SyncML | | |
| Website | Website | Website |
