Compare Phones
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| Phone | Samsung SGH-X640 | Nokia 1661 | Nokia Lumia 521 / 520 | Nubia RedMagic 5S | ZTE Z331 |
| Current U.S. Carriers | (none) | (none) | (none) | (none) | (none) |
| Global Availability | Released | Released | Released | Released | Released |
| Specifications | |||||
|---|---|---|---|---|---|
| Display Size | ? |
1.8" diag. 4 : 3 |
4" diag. 5 : 3 |
6.7" diag. 19.5 : 9 |
2.4" diag. 4 : 3 |
| Display Resolution & Type |
128 x 160 pixels LCD (TFT/TFD) |
128 x 160 pixels (~114 ppi) LCD (TFT/TFD) |
480 x 800 pixels (~233 ppi) LCD (TFT/TFD) |
1080 x 2340 pixels (~388 ppi) AMOLED |
176 x 220 pixels (~117 ppi) LCD (TFT/TFD) |
| Display Refresh | ? | ? | ? | 144 Hz | ? |
| Battery | 800 mAh | 860 mAh | 1,430 mAh | 4,500 mAh | 950 mAh |
| Processor | ? | ? | 1 GHz Qualcomm Snapdragon S4 MSM8270 | Qualcomm Snapdragon 865 | ? |
| RAM | ? | ? | 512 MB | 8 GB * | ? |
| Storage | ? raw hardware | ? raw hardware | 8 GB | 128 GB * | ? raw hardware |
| Main Camera | Yes | - | 5 megapixel | 64 megapixel | 3 megapixel |
| Wide Camera | - | - | - | 8 megapixel | - |
| Tele Camera | - | - | - | - | - |
| Video Capture | - | - | 720p HD | 4K UHD | QCIF (176 x 144) |
| Front Camera | - | - | - | 8 megapixel | - |
| Weight |
3 oz (85g) |
2.9 oz (82g) |
4.39 oz (124g) |
7.76 oz (220g) |
4 oz (113g) |
| Dimensions |
3.43" x 1.81" x 0.91" (87 x 46 x 23.1 mm) |
4.25" x 1.8" x 0.53" (108 x 46 x 13.5 mm) |
4.72" x 2.52" x 0.39" (120 x 64 x 9.9 mm) |
6.64" x 3.07" x 0.38" (169 x 78 x 9.8 mm) |
3.84" x 2.02" x 0.69" (98 x 51 x 17.5 mm) |
| Form Factor | Clamshell | Slab | Slab | Slab | Clamshell |
| Platform / OS | (proprietary) | (proprietary) | Windows | Android | (proprietary) |
| Network Bands |
GSM: 900, 1800, 1900 |
GSM: 850, 1900 |
5G: 41, 78 4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 18, 19, 20, 26, 34, 38, 40, 41 WCDMA: 1, 2, 4, 5, 8, 19 CDMA: 850, 1900 GSM: 850, 900, 1800, 1900 |
WCDMA: 1, 2, 5 GSM: 850, 900, 1800, 1900 |
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| Data Technology | GPRS | - | HSPA+ 21 | NR (5G) | HSDPA 3.6 |
| Features | |||||
| Fingerprint Reader | - | - | - | Yes | - |
| Flashlight | - | Yes | - | Yes | - |
| GPS / Location | - | - | n/a | n/a | Yes |
| Accessibility | |||||
| Hearing Aid Compatible | - | - | Yes | - | Yes |
| Multiple Languages | Yes | - | n/a | n/a | Yes |
| TTY/TDD (Digital) | - | - | Yes | - | Yes |
| Alerts | |||||
| Extra Display | - | - | - | - | Yes |
| Ringer Profiles | - | Yes | - | - | Yes |
| Connectivity | |||||
| Bluetooth | - | - | Yes | Yes | Yes |
| Mobile Hotspot | - | - | n/a | n/a | - |
| USB | - | - | Yes |
Yes USB Type C |
Yes Micro-USB |
| Wi-Fi | - | - | Yes |
Yes 6 (802.11 a,ac,ax,b,g,n) |
- |
| Contacts | |||||
| Picture ID | Yes | - | n/a | n/a | Yes |
| Ringer ID | Yes | - | n/a | n/a | Yes |
| Voice Dialing | - | - | n/a | n/a | - |
| Customization | |||||
| Custom Graphics | Yes | - | n/a | n/a | Yes |
| Custom Ringtones | Yes | - | n/a | n/a | Yes |
| Real-Music Ringers | - | - | n/a | n/a | Yes |
| Data & Network | |||||
| Data Tethering | - | - | n/a | n/a | Yes |
| Dual-SIM | - | - | - | Yes | - |
| WAP / Web Browser | Yes | - | n/a | n/a | Yes |
| Input | |||||
| Predictive Text Entry | Yes | Yes | n/a | n/a | Yes |
| Side Keys | Yes | - | Yes | Yes | Yes |
| Touch Screen | - | - | Yes | Yes | - |
| Memory | |||||
| Memory Card Slot | - | - | Yes | - | Yes |
| Messaging | |||||
| Email Client | - | - | n/a | n/a | Yes |
| EMS / Picture Messaging | Yes | - | n/a | n/a | - |
| Instant Messaging | - | - | n/a | n/a | Yes |
| MMS | Yes | - | n/a | n/a | Yes |
| Text Messaging Templates | Yes | - | n/a | n/a | Yes |
| Music | |||||
| FM Radio | - | Yes | - | - | - |
| Headphone Jack (3.5mm) | - | - | Yes | Yes | - |
| Music Player | - | - | n/a | n/a | Yes |
| Stereo Speakers | - | - | - | Yes | - |
| Photo & Video | |||||
| TV Output | - | - | - | Yes | - |
| Power | |||||
| Fast Charging | - | - | - | Yes | - |
| Productivity | |||||
| Alarm | Yes | Yes | n/a | n/a | Yes |
| Calculator | Yes | Yes | n/a | n/a | Yes |
| Calendar | Yes | Yes | n/a | n/a | Yes |
| To-Do List | Yes | - | n/a | n/a | - |
| Voice Memo | Yes | Yes | n/a | n/a | Yes |
| Software | |||||
| Games | Yes | Yes | n/a | n/a | Yes |
| Java (J2ME) | Yes | - | n/a | n/a | Yes |
| Voice | |||||
| Headset Jack (2.5 mm) | Yes | Yes | n/a | n/a | - |
| Speaker Phone | Yes | Yes | Yes | Yes | Yes |
| Samsung SGH-X640 | Nokia 1661 | Nokia Lumia 521 / 520 | Nubia RedMagic 5S | ZTE Z331 | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Samsung SGH-X640 | Nokia 1661 | Nokia Lumia 521 / 520 | Nubia RedMagic 5S | ZTE Z331 |
