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| Phone | Sony Ericsson Z550a | Motorola ROKR E2 | Nokia Lumia 521 / 520 | LG Invision |
| Current U.S. Carriers | (none) | (none) | (none) | (none) |
| Global Availability | Released | Released | Released | Released |
| Specifications | ||||
|---|---|---|---|---|
| Display Size |
1.9" diag. 4 : 3 |
? |
4" diag. 5 : 3 |
2.2" diag. 4 : 3 |
| Display Resolution & Type |
176 x 220 pixels (~148 ppi) LCD (TFT/TFD) |
240 x 320 pixels LCD (TFT/TFD) |
480 x 800 pixels (~233 ppi) LCD (TFT/TFD) |
320 x 240 pixels (~182 ppi) LCD (TFT/TFD) |
| Display Refresh | ? | ? | ? | ? |
| Battery | ? | ? | 1,430 mAh | 900 mAh |
| Processor | ? | ? | 1 GHz Qualcomm Snapdragon S4 MSM8270 | ? |
| RAM | ? | ? | 512 MB | ? |
| Storage | ? raw hardware | ? raw hardware | 8 GB | ? raw hardware |
| Main Camera | 1 megapixel | 1 megapixel | 5 megapixel | 1 megapixel |
| Wide Camera | - | - | - | - |
| Tele Camera | - | - | - | - |
| Video Capture | ? | ? | 720p HD | QVGA (320 x 240) |
| Front Camera | - | - | - | - |
| Weight |
3.26 oz (92g) |
3.77 oz (107g) |
4.39 oz (124g) |
2.85 oz (81g) |
| Dimensions |
3.43" x 1.77" x 0.79" (87 x 45 x 20.1 mm) |
4.17" x 1.95" x 0.71" (106 x 50 x 18 mm) |
4.72" x 2.52" x 0.39" (120 x 64 x 9.9 mm) |
4.05" x 2.08" x 0.47" (103 x 53 x 11.9 mm) |
| Form Factor | Clamshell | Slab | Slab | Slab |
| Platform / OS | (proprietary) | (proprietary) | Windows | (proprietary) |
| Network Bands |
GSM: 850, 900, 1800, 1900 |
GSM: 900, 1800, 1900 |
WCDMA: 2, 5 GSM: 850, 900, 1800, 1900 |
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| Data Technology | GPRS | EDGE | HSPA+ 21 | HSDPA 3.6 |
| Features | ||||
| GPS / Location | - | - | n/a | - |
| Accessibility | ||||
| Hearing Aid Compatible | - | - |
Yes M3, T4 (very tele-coil compatible) |
- |
| Multiple Languages | Yes | Yes | n/a | Yes |
| TTY/TDD (Digital) | Yes | - | Yes | Yes |
| Alerts | ||||
| Extra Display | Yes | - | - | - |
| Ringer Profiles | Yes | Yes | - | - |
| Connectivity | ||||
| Bluetooth | Yes | Yes | Yes | Yes |
| Mobile Hotspot | - | - | n/a | - |
| USB | Yes | Yes | Yes | Yes |
| Wi-Fi | - | - | Yes | - |
| Contacts | ||||
| Picture ID | Yes | Yes | n/a | Yes |
| Ringer ID | Yes | Yes | n/a | Yes |
| Voice Dialing | Yes | Yes | n/a | Yes |
| Customization | ||||
| Custom Graphics | Yes | Yes | n/a | Yes |
| Custom Ringtones | Yes | Yes | n/a | Yes |
| Real-Music Ringers | Yes | - | n/a | Yes |
| Data & Network | ||||
| Data Tethering | Yes | Yes | n/a | - |
| WAP / Web Browser | Yes | Yes | n/a | Yes |
| Input | ||||
| Predictive Text Entry | Yes | Yes | n/a | Yes |
| Side Keys | Yes | Yes | Yes | Yes |
| Touch Screen | - | - |
Yes Capacitive |
- |
| Memory | ||||
| Memory Card Slot | Yes | Yes | Yes | Yes |
| Messaging | ||||
| Email Client | Yes | Yes | n/a | Yes |
| Instant Messaging | - | - | n/a | Yes |
| MMS | Yes | Yes | n/a | Yes |
| Text Messaging Templates | Yes | Yes | n/a | Yes |
| Music | ||||
| FM Radio | Yes | Yes | - | - |
| Headphone Jack (3.5mm) | - | Yes | Yes | - |
| Music Player | Yes | Yes | n/a | Yes |
| Productivity | ||||
| Alarm | Yes | Yes | n/a | Yes |
| Calculator | Yes | Yes | n/a | Yes |
| Calendar | Yes | Yes | n/a | Yes |
| To-Do List | Yes | Yes | n/a | - |
| Voice Memo | Yes | Yes | n/a | Yes |
| Software | ||||
| Games | Yes | Yes | n/a | Yes |
| Java (J2ME) | Yes | Yes | n/a | Yes |
| Voice | ||||
| Push-To-Talk | Yes * | - | - | - |
| Speaker Phone | Yes | Yes | Yes | Yes |
| * Some versions only | ||||
| Sony Ericsson Z550a | Motorola ROKR E2 | Nokia Lumia 521 / 520 | LG Invision | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Sony Ericsson Z550a | Motorola ROKR E2 | Nokia Lumia 521 / 520 | LG Invision |
