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| Phone | Samsung SGH-X640 | Nokia 6255i / 6256i | ZTE Blade Z Max | Nuu F4L |
| Current U.S. Carriers | (none) | (none) | (none) | (none) |
| Global Availability | Released | Released | Released | Not yet released |
| Specifications | ||||
|---|---|---|---|---|
| Display Size | ? | ? |
6" diag. 16 : 9 |
2.8" diag. 4 : 3 |
| Display Resolution & Type |
128 x 160 pixels LCD (TFT/TFD) |
128 x 160 pixels LCD (TFT/TFD) |
1080 x 1920 pixels (~367 ppi) LCD (TFT/TFD) |
240 x 320 pixels (~143 ppi) LCD (STN) |
| Display Refresh | ? | ? | 60 Hz | 60 Hz |
| Battery | 800 mAh | 1,070 mAh | 4,080 mAh | 1,350 mAh |
| Processor | ? | ? | 1.4 GHz Qualcomm Snapdragon 435 (MSM8940) | 1.1 GHz MediaTek MT6731 |
| RAM | ? | ? | 2 GB | 512 MB |
| Storage | ? raw hardware | ? raw hardware | 32 GB | 4 GB |
| Main Camera | Yes | Yes | 16 megapixel | 2 megapixel |
| Wide Camera | - | - | - | - |
| Tele Camera | - | - | - | - |
| Video Capture | - | ? | 1080p HD | 720p HD |
| Front Camera | - | - | 8 megapixel | Yes |
| Weight |
3 oz (85g) |
4.23 oz (120g) |
6.58 oz (186g) |
4.5 oz (128g) |
| Dimensions |
3.43" x 1.81" x 0.91" (87 x 46 x 23.1 mm) |
3.36" x 1.87" x 0.97" (85 x 47 x 24.6 mm) |
6.51" x 3.28" x 0.33" (165 x 83 x 8.3 mm) |
4.31" x 2.27" x 0.83" (109 x 58 x 21 mm) |
| Form Factor | Clamshell | Clamshell | Slab | Clamshell |
| Platform / OS | (proprietary) | (proprietary) | Android | (proprietary) |
| Network Bands |
GSM: 900, 1800, 1900 |
CDMA: 850, 1900 AMPS: 850 |
4G LTE: 2, 4, 5, 12, 66 WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900 |
4G LTE: 2, 4, 5, 12, 13, 66 WCDMA: 2, 4, 5 GSM: 850, 1900 |
| Data Technology | GPRS | 1xRTT | LTE (Cat 6) | LTE (Cat 4) |
| Features | ||||
| Fingerprint Reader | - | - |
Yes stand-alone |
- |
| Flashlight | - | - | Yes | Yes |
| GPS / Location | - | Yes | n/a | Yes |
| Accessibility | ||||
| Adjustable Text Size | - | - | n/a | Yes |
| Hearing Aid Compatible | - | Yes | Yes | Yes |
| Multiple Languages | Yes | Yes | n/a | Yes |
| TTY/TDD (Digital) | - | Yes | Yes | Yes |
| Alerts | ||||
| Extra Display | - | Yes | - | Yes |
| Ringer Profiles | - | Yes | - | - |
| Connectivity | ||||
| Bluetooth | - | Yes | Yes | Yes |
| Infrared (IR) | - | Yes | - | - |
| USB | - | Yes |
Yes USB Type C |
Yes Micro-USB |
| Wi-Fi | - | - |
Yes 4 (802.11 b,g,n) |
Yes 4 (802.11 b,g,n) |
| Contacts | ||||
| Picture ID | Yes | Yes | n/a | Yes |
| Ringer ID | Yes | Yes | n/a | Yes |
| Voice Dialing | - | Yes | n/a | - |
| Customization | ||||
| Custom Graphics | Yes | Yes | n/a | Yes |
| Custom Ringtones | Yes | Yes | n/a | - |
| Real-Music Ringers | - | Yes | n/a | - |
| Data & Network | ||||
| Data Tethering | - | 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 | - |
| Memory | ||||
| Memory Card Slot | - | Yes | Yes | Yes |
| Messaging | ||||
| Email Client | - | Yes | n/a | Yes |
| EMS / Picture Messaging | Yes | Yes * | n/a | - |
| Instant Messaging | - | - | n/a | Yes |
| MMS | Yes | Yes | n/a | Yes |
| Text Messaging Templates | Yes | Yes | n/a | Yes |
| Music | ||||
| FM Radio | - | Yes | Yes | Yes |
| Headphone Jack (3.5mm) | - | - | Yes | Yes |
| Music Player | - | Yes * | n/a | Yes |
| Power | ||||
| Fast Charging | - | - | 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 | ||||
| BREW | - | Yes * | n/a | - |
| Games | Yes | Yes | n/a | - |
| Java (J2ME) | Yes | Yes * | n/a | - |
| Voice | ||||
| HD Voice | - | - | Yes | Yes |
| Headset Jack (2.5 mm) | Yes | Yes | n/a | - |
| Speaker Phone | Yes | Yes | Yes | Yes |
| * Some versions only | ||||
| Samsung SGH-X640 | Nokia 6255i / 6256i | ZTE Blade Z Max | Nuu F4L | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Samsung SGH-X640 | Nokia 6255i / 6256i | ZTE Blade Z Max | Nuu F4L |
