| Manufacture | Sony Ericsson | Nokia |
| Model | Z550 | 6303i Classic |
| Form factor | Clamshell/fold | Block |
| Weight | 93 gram | 96.00 |
| Dimensions (HxWxD) | 88 x 45 x 21 | 109.00 x 46.00 x 12.00 |
| Operating System | Other | Series 40 |
| Networks | 2G - 900/1800/1900
| 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 | 1.3 Megapixels. 4x digital zoom | 3.2 megapixel, 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 | 1.9 inches | 2.20 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | 262144 | 16000000 |
| Display width | 176 | 240 |
| Display height | 220 | 320 |
| PPI | 148.28 | 181.82 |
| Second Display | NA | NA |
| CPU | NA | NA |
| GPU | NA | NA |
| Memory | 20MB, Expandable with memory card | 55 MB. Expandable up to 8 GB with microSD card |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | Polyphonic 40 voices | MP3, WMA, WAV, NB-AMR, WB-AMR, MIDI, AAC, AAC+, eAAC+ |
| Java | | |
| Games | NA | Yes. 8 |
| FM Radio | | |
| Battery | NA | 1050 mAh |
| Standby time (h) | 320 | 515 |
| Talktime (m) | 330 | 480 |
| Wireless Charging | | |
| Browser | 2.0 XHTML | 2.0 XHTML, HTML. Nokia OSS web browser. Opera Mini |
| Calendar | | |
| Voicedialing | NA | |
| IP Code | NA | NA |
| Predictive text | | |
| RSS reader | | |
| Voicememo | | |
| PC Synchronization | | |
| SyncML | | |
| Website | Website | Website |
