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| Phone | Samsung SGH-X640 | ZTE Z331 | LG Stylo 4 | HTC G2 |
| Current U.S. Carriers | (none) | (none) | (none) | (none) |
| Global Availability | Released | Released | Released | Released |
| Specifications | ||||
|---|---|---|---|---|
| Display Size | ? |
2.4" diag. 4 : 3 |
6.2" diag. 18 : 9 |
3.7" diag. 5 : 3 |
| Display Resolution & Type |
128 x 160 pixels LCD (TFT/TFD) |
176 x 220 pixels (~117 ppi) LCD (TFT/TFD) |
1080 x 2160 pixels (~390 ppi) LCD (TFT/TFD) |
480 x 800 pixels (~252 ppi) LCD (TFT/TFD) |
| Display Refresh | ? | ? | 60 Hz | 60 Hz |
| Battery | 800 mAh | 950 mAh | 3,300 mAh | 1,300 mAh |
| Processor | ? | ? | 1.8 GHz Qualcomm Snapdragon 450 | 800 MHz Qualcomm S2 MSM7230 |
| RAM | ? | ? | 2 GB * | ? |
| Storage | ? raw hardware | ? raw hardware | 32 GB * | ? raw hardware |
| Main Camera | Yes | 3 megapixel | 13 megapixel | 5 megapixel |
| Wide Camera | - | - | - | - |
| Tele Camera | - | - | - | - |
| Video Capture | - | QCIF (176 x 144) | 1080p HD | 720p HD |
| Front Camera | - | - | 5 megapixel | - |
| Weight |
3 oz (85g) |
4 oz (113g) |
6.07 oz (172g) |
6.5 oz (184g) |
| Dimensions |
3.43" x 1.81" x 0.91" (87 x 46 x 23.1 mm) |
3.84" x 2.02" x 0.69" (98 x 51 x 17.5 mm) |
6.31" x 3.06" x 0.33" (160 x 78 x 8.4 mm) |
4.68" x 2.37" x 0.55" (119 x 60 x 14 mm) |
| Form Factor | Clamshell | Clamshell | Slab | Slab |
| Platform / OS | (proprietary) | (proprietary) | Android | Android |
| Network Bands |
GSM: 900, 1800, 1900 |
WCDMA: 1, 2, 5 GSM: 850, 900, 1800, 1900 |
4G LTE: 1, 2, 3, 4, 5, 7, 12, 13, 14, 20, 29, 30, 38, 41, 66, 71 WCDMA: 1, 2, 4, 5 GSM: 850, 900, 1800, 1900 |
WCDMA: 1, 4 GSM: 850, 900, 1800, 1900 |
| Data Technology | GPRS | HSDPA 3.6 | LTE (Cat 6) | HSPA 14.4 |
| Features | ||||
| Fingerprint Reader | - | - |
Yes stand-alone |
- |
| Flashlight | - | - | Yes | - |
| GPS / Location | - | Yes | n/a | n/a |
| Accessibility | ||||
| Hearing Aid Compatible | - |
Yes M3, T4 (very tele-coil compatible) |
Yes M4, T3 (mostly tele-coil compatible) |
Yes M3 (mostly compatible) |
| Multiple Languages | Yes | Yes | n/a | n/a |
| TTY/TDD (Digital) | - | Yes | Yes | - |
| Alerts | ||||
| Extra Display | - | Yes | - | - |
| Ringer Profiles | - | Yes | - | - |
| Connectivity | ||||
| Bluetooth | - | Yes | Yes | Yes |
| Mobile Hotspot | - | - | n/a | n/a |
| NFC | - | - | Yes * | - |
| USB | - |
Yes Micro-USB |
Yes USB Type C |
Yes |
| Wi-Fi | - | - |
Yes 5 (802.11 a,ac,b,g,n) |
Yes 4 (802.11 b,g,n) |
| Contacts | ||||
| Picture ID | Yes | Yes | n/a | n/a |
| Ringer ID | Yes | Yes | n/a | n/a |
| Voice Dialing | - | - | n/a | n/a |
| Customization | ||||
| Custom Graphics | Yes | Yes | n/a | n/a |
| Custom Ringtones | Yes | Yes | n/a | n/a |
| Real-Music Ringers | - | Yes | n/a | n/a |
| Data & Network | ||||
| Data Tethering | - | Yes | n/a | n/a |
| WAP / Web Browser | Yes | Yes | n/a | n/a |
| Input | ||||
| Predictive Text Entry | Yes | Yes | n/a | n/a |
| Side Keys | Yes | Yes | Yes | Yes |
| Stylus | - | - | Yes | - |
| Text Keyboard, Hardware | - | - | - | Yes |
| Touch Screen | - | - |
Yes Capacitive |
Yes Capacitive |
| Memory | ||||
| Memory Card Slot | - | Yes | Yes | Yes |
| Messaging | ||||
| Email Client | - | Yes | n/a | n/a |
| EMS / Picture Messaging | Yes | - | n/a | n/a |
| Instant Messaging | - | Yes | n/a | n/a |
| MMS | Yes | Yes | n/a | n/a |
| Text Messaging Templates | Yes | Yes | n/a | n/a |
| Music | ||||
| FM Radio | - | - | Yes | - |
| Headphone Jack (3.5mm) | - | - | Yes | Yes |
| Music Player | - | Yes | n/a | n/a |
| Photo & Video | ||||
| DLNA | - | - | Yes | - |
| Productivity | ||||
| Alarm | Yes | Yes | n/a | n/a |
| Calculator | Yes | Yes | n/a | n/a |
| Calendar | Yes | Yes | n/a | n/a |
| To-Do List | Yes | - | n/a | n/a |
| Voice Memo | Yes | Yes | n/a | n/a |
| Software | ||||
| Games | Yes | Yes | n/a | n/a |
| Java (J2ME) | Yes | Yes | n/a | n/a |
| Voice | ||||
| HD Voice | - | - | Yes | - |
| Headset Jack (2.5 mm) | Yes | - | n/a | n/a |
| Speaker Phone | Yes | Yes | Yes | Yes |
| * Some versions only | ||||
| Samsung SGH-X640 | ZTE Z331 | LG Stylo 4 | HTC G2 | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Samsung SGH-X640 | ZTE Z331 | LG Stylo 4 | HTC G2 |
