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| Phone | Samsung SGH-X640 | Nokia Lumia 521 / 520 | Sony Xperia XZ1 | BlackBerry Key2 | Motorola Moto z4 |
| Current U.S. Carriers | (none) | (none) | (none) | (none) | (none) |
| Global Availability | Released | Released | Released | Released | Released |
| Specifications | |||||
|---|---|---|---|---|---|
| Display Size | ? |
4" diag. 5 : 3 |
5.2" diag. 16 : 9 |
4.5" diag. 5 : 3 |
6.4" diag. 19.5 : 9 |
| Display Resolution & Type |
128 x 160 pixels LCD (TFT/TFD) |
480 x 800 pixels (~233 ppi) LCD (TFT/TFD) |
1080 x 1920 pixels (~424 ppi) LCD (TFT/TFD) |
1080 x 1620 pixels (~433 ppi) LCD (TFT/TFD) |
1080 x 2340 pixels (~403 ppi) AMOLED |
| Display Refresh | ? | ? | 60 Hz | 60 Hz | 60 Hz |
| Battery | 800 mAh | 1,430 mAh | 2,700 mAh | 3,500 mAh | 3,600 mAh |
| Processor | ? | 1 GHz Qualcomm Snapdragon S4 MSM8270 | 2.5 GHz Qualcomm Snapdragon 835 (MSM8998) | 2.2 GHz Qualcomm Snapdragon 660 | 2 GHz Qualcomm Snapdragon 675 |
| RAM | ? | 512 MB | 4 GB | 6 GB | 4 GB |
| Storage | ? raw hardware | 8 GB | 64 GB | 64 GB * | 128 GB |
| Main Camera | Yes | 5 megapixel | 19 megapixel | 12 megapixel | 48 megapixel |
| Wide Camera | - | - | - | - | - |
| Tele Camera | - | - | - | 12 megapixel | - |
| Video Capture | - | 720p HD | 4K UHD | 4K UHD | 4K UHD |
| Front Camera | - | - | 13 megapixel | 8 megapixel | 25 megapixel |
| Weight |
3 oz (85g) |
4.39 oz (124g) |
5.5 oz (156g) |
5.93 oz (168g) |
6 oz (170g) |
| Dimensions |
3.43" x 1.81" x 0.91" (87 x 46 x 23.1 mm) |
4.72" x 2.52" x 0.39" (120 x 64 x 9.9 mm) |
5.82" x 2.89" x 0.29" (148 x 73 x 7.4 mm) |
5.96" x 2.82" x 0.33" (151 x 72 x 8.4 mm) |
6.22" x 2.96" x 0.29" (158 x 75 x 7.4 mm) |
| Form Factor | Clamshell | Slab | Slab | Slab | Slab |
| Platform / OS | (proprietary) | Windows | Android | Android | Android |
| Network Bands |
GSM: 900, 1800, 1900 |
4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 25, 26, 28, 29, 40, 41, 66 WCDMA: 1, 2, 4, 5, 8 GSM: 850, 900, 1800, 1900 |
4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 20, 28, 29, 30, 38, 40, 41, 66 WCDMA: 1, 2, 4, 5, 8 GSM: 850, 900, 1800, 1900 |
4G LTE: 2, 3, 4, 5, 7, 12, 13, 20, 25, 26, 28, 29, 30, 38, 41, 66, 71 WCDMA: 1, 2, 4, 5, 8 CDMA: 800, 850, 1900 GSM: 850, 900, 1800, 1900 |
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| Data Technology | GPRS | HSPA+ 21 | LTE (Cat 16) | LTE (Cat 11) | LTE (Cat 12) |
| Features | |||||
| Barometer | - | - | Yes | - | - |
| Fingerprint Reader | - | - |
Yes * stand-alone |
Yes stand-alone |
Yes |
| Flashlight | - | - | Yes | Yes | Yes |
| GPS / Location | - | n/a | n/a | n/a | n/a |
| Water-Resistant | - | - |
Yes IPX8 (SCUBA) |
- | Yes |
| Accessibility | |||||
| Hearing Aid Compatible | - |
Yes M3, T4 (very tele-coil compatible) |
Yes M4, T4 (very tele-coil compatible) |
Yes M4, T3 (mostly tele-coil compatible) |
Yes M4, T4 (very tele-coil compatible) |
| Multiple Languages | Yes | n/a | n/a | n/a | n/a |
| TTY/TDD (Digital) | - | Yes | Yes | Yes | Yes |
| Connectivity | |||||
| Bluetooth | - | Yes | Yes | Yes | Yes |
| Mobile Hotspot | - | n/a | n/a | n/a | n/a |
| NFC | - | - | Yes | Yes | Yes |
| USB | - | Yes |
Yes USB Type C |
Yes USB Type C |
Yes USB Type C |
| Wi-Fi | - | Yes |
Yes 5 (802.11 a,ac,b,g,n) |
Yes 5 (802.11 a,ac,b,g,n) |
Yes 5 (802.11 a,ac,b,g,n) |
| Contacts | |||||
| Picture ID | Yes | n/a | n/a | n/a | n/a |
| Ringer ID | Yes | n/a | n/a | n/a | n/a |
| Voice Dialing | - | n/a | n/a | n/a | n/a |
| Customization | |||||
| Custom Graphics | Yes | n/a | n/a | n/a | n/a |
| Custom Ringtones | Yes | n/a | n/a | n/a | n/a |
| Real-Music Ringers | - | n/a | n/a | n/a | n/a |
| Data & Network | |||||
| Data Tethering | - | n/a | n/a | n/a | n/a |
| Dual-SIM | - | - | Yes * | - | - |
| WAP / Web Browser | Yes | n/a | n/a | n/a | n/a |
| Input | |||||
| Predictive Text Entry | Yes | n/a | n/a | n/a | n/a |
| Side Keys | Yes | Yes | Yes | Yes | Yes |
| Text Keyboard, Hardware | - | - | - | Yes | - |
| Touch Screen | - |
Yes Capacitive |
Yes Capacitive |
Yes Capacitive |
Yes Capacitive |
| Memory | |||||
| Memory Card Slot | - | Yes | Yes | Yes | Yes |
| Messaging | |||||
| Email Client | - | n/a | n/a | n/a | n/a |
| EMS / Picture Messaging | Yes | n/a | n/a | n/a | n/a |
| Instant Messaging | - | n/a | n/a | n/a | n/a |
| MMS | Yes | n/a | n/a | n/a | n/a |
| Text Messaging Templates | Yes | n/a | n/a | n/a | n/a |
| Music | |||||
| FM Radio | - | - | - | Yes | Yes |
| Headphone Jack (3.5mm) | - | Yes | Yes | Yes | Yes |
| Music Player | - | n/a | n/a | n/a | n/a |
| Stereo Speakers | - | - | Yes | - | - |
| Photo & Video | |||||
| DLNA | - | - | Yes | - | - |
| Miracast | - | - | Yes | - | - |
| TV Output | - | - | - | Yes | - |
| Power | |||||
| Fast Charging | - | - | Yes | Yes | Yes |
| Productivity | |||||
| Alarm | Yes | n/a | n/a | n/a | n/a |
| Calculator | Yes | n/a | n/a | n/a | n/a |
| Calendar | Yes | n/a | n/a | n/a | n/a |
| To-Do List | Yes | n/a | n/a | n/a | n/a |
| Voice Memo | Yes | n/a | n/a | n/a | n/a |
| Software | |||||
| Games | Yes | n/a | n/a | n/a | n/a |
| Java (J2ME) | Yes | n/a | n/a | n/a | n/a |
| Voice | |||||
| HD Voice | - | - | Yes | Yes | Yes |
| Headset Jack (2.5 mm) | Yes | n/a | n/a | n/a | n/a |
| Speaker Phone | Yes | Yes | Yes | Yes | Yes |
| * Some versions only | |||||
| Samsung SGH-X640 | Nokia Lumia 521 / 520 | Sony Xperia XZ1 | BlackBerry Key2 | Motorola Moto z4 | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Samsung SGH-X640 | Nokia Lumia 521 / 520 | Sony Xperia XZ1 | BlackBerry Key2 | Motorola Moto z4 |
