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| Phone | Nokia Lumia 521 / 520 | Samsung SGH-X820 | Samsung SGH-X640 |
| Current U.S. Carriers | (none) | (none) | (none) |
| Global Availability | Released | Released | Released |
| Specifications | |||
|---|---|---|---|
| Display Size |
4" diag. 5 : 3 |
? | ? |
| Display Resolution & Type |
480 x 800 pixels (~233 ppi) LCD (TFT/TFD) |
220 x 176 pixels LCD (TFT/TFD) |
128 x 160 pixels LCD (TFT/TFD) |
| Display Refresh | ? | ? | ? |
| Battery | 1,430 mAh | 650 mAh | 800 mAh |
| Processor | 1 GHz Qualcomm Snapdragon S4 MSM8270 | ? | ? |
| RAM | 512 MB | ? | ? |
| Storage | 8 GB | ? raw hardware | ? raw hardware |
| Main Camera | 5 megapixel | 2 megapixel | Yes |
| Wide Camera | - | - | - |
| Tele Camera | - | - | - |
| Video Capture | 720p HD | ? | - |
| Front Camera | - | - | - |
| Weight |
4.39 oz (124g) |
2.33 oz (66g) |
3 oz (85g) |
| Dimensions |
4.72" x 2.52" x 0.39" (120 x 64 x 9.9 mm) |
4.45" x 1.97" x 0.27" (113 x 50 x 6.9 mm) |
3.43" x 1.81" x 0.91" (87 x 46 x 23.1 mm) |
| Form Factor | Slab | Slab | Clamshell |
| Platform / OS | Windows | (proprietary) | (proprietary) |
| Network Bands |
GSM: 900, 1800, 1900 |
GSM: 900, 1800, 1900 |
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| Data Technology | HSPA+ 21 | EDGE | GPRS |
| Features | |||
| GPS / Location | n/a | - | - |
| Accessibility | |||
| Hearing Aid Compatible |
Yes M3, T4 (very tele-coil compatible) |
- | - |
| Multiple Languages | n/a | Yes | Yes |
| TTY/TDD (Digital) | Yes | - | - |
| Connectivity | |||
| Bluetooth | Yes | Yes | - |
| Mobile Hotspot | n/a | - | - |
| USB | Yes | Yes | - |
| Wi-Fi | Yes | - | - |
| Contacts | |||
| Picture ID | n/a | Yes | Yes |
| Ringer ID | n/a | Yes | Yes |
| Voice Dialing | n/a | - | - |
| Customization | |||
| Custom Graphics | n/a | Yes | Yes |
| Custom Ringtones | n/a | Yes | Yes |
| Real-Music Ringers | n/a | Yes | - |
| Data & Network | |||
| Data Tethering | n/a | - | - |
| External Antenna Jack | n/a | Yes | - |
| WAP / Web Browser | n/a | Yes | Yes |
| Input | |||
| Predictive Text Entry | n/a | Yes | Yes |
| Side Keys | Yes | Yes | Yes |
| Touch Screen |
Yes Capacitive |
- | - |
| Memory | |||
| Memory Card Slot | Yes | - | - |
| Messaging | |||
| Email Client | n/a | Yes | - |
| EMS / Picture Messaging | n/a | Yes | Yes |
| Instant Messaging | n/a | - | - |
| MMS | n/a | Yes | Yes |
| Text Messaging Templates | n/a | Yes | Yes |
| Music | |||
| Headphone Jack (3.5mm) | Yes | - | - |
| Music Player | n/a | - | - |
| Photo & Video | |||
| TV Output | - | Yes | - |
| Productivity | |||
| Alarm | n/a | Yes | Yes |
| Calculator | n/a | Yes | Yes |
| Calendar | n/a | Yes | Yes |
| To-Do List | n/a | Yes | Yes |
| Voice Memo | n/a | Yes | Yes |
| Software | |||
| Games | n/a | Yes | Yes |
| Java (J2ME) | n/a | Yes | Yes |
| Voice | |||
| Headset Jack (2.5 mm) | n/a | - | Yes |
| Speaker Phone | Yes | Yes | Yes |
| Nokia Lumia 521 / 520 | Samsung SGH-X820 | Samsung SGH-X640 | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Nokia Lumia 521 / 520 | Samsung SGH-X820 | Samsung SGH-X640 |
