| Manufacture | Nokia | Sony Ericsson |
| Model | 6600 Fold | K550 |
| Form factor | Clamshell/fold | Block |
| Weight | 110 gram | 85.00 |
| Dimensions (HxWxD) | 88 x 44 x 16 | 102.00 x 46.00 x 14.00 |
| Operating System | Series 40 | Other |
| Networks | 2G - 850/900/1800/1900
3G - 850/2100 | 2G - 850/900/1800/1900
|
| 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 megapixel. 8x digital zoom | 2 Megapixels with auto-focus. 2.25x digital zoom |
| Image Stabilization | | |
| BSI sensor | | |
| Camera Flash/Light | | |
| Flash type | NA | NA |
| Video recording | | |
| Video capture resolution | NA | NA |
| Second Camera | VGA | NA |
| Display size | 2.13 inches | 1.90 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | 16000000 | 262144 |
| Display width | 240 | 176 |
| Display height | 320 | 220 |
| PPI | 187.79 | 148.28 |
| Second Display | 128 x 160 | NA |
| CPU | NA | NA |
| GPU | NA | NA |
| Memory | 18 MB. Epandable. 512 included on midcroSD card | 64MB. Expandable with Memory Stick Micro card |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | MP3, AAC, AAC+, eAAC+, WMA | Polyphonic, MP3, AAC |
| Java | NA | |
| Games | NA | Java |
| FM Radio | | |
| Battery | NA | 950 mAh |
| Standby time (h) | 300 | 350 |
| Talktime (m) | 250 | 420 |
| Wireless Charging | | |
| Browser | 2.0 XHTML, HTML | 2.0 XHTML |
| Calendar | | |
| Voicedialing | | |
| IP Code | NA | NA |
| Predictive text | | |
| RSS reader | | |
| Voicememo | | |
| PC Synchronization | | |
| SyncML | | |
| Website | Website | Website |
