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| Phone | Samsung SGH-X640 | ZTE Engage LT / Engage MT | Apple iPhone 4S |
| Current U.S. Carriers | (none) | (none) | (none) |
| Global Availability | Released | Released | Released |
| Specifications | |||
|---|---|---|---|
| Display Size | ? |
4" diag. 5 : 3 |
3.5" diag. 5 : 3 |
| Display Resolution & Type |
128 x 160 pixels LCD (TFT/TFD) |
480 x 800 pixels (~233 ppi) LCD (TFT/TFD) |
640 x 960 pixels (~330 ppi) LCD (TFT/TFD) |
| Display Refresh | ? | 60 Hz | 60 Hz |
| Battery | 800 mAh | 1,900 mAh | ? |
| Processor | ? | ? | Apple A5 |
| RAM | ? | 1 GB | ? |
| Storage | ? raw hardware | 4 GB | 64 GB * |
| Main Camera | Yes | 3 megapixel | 8 megapixel |
| Wide Camera | - | - | - |
| Tele Camera | - | - | - |
| Video Capture | - | WVGA / 480p | 1080p HD |
| Front Camera | - | Yes | Yes |
| Weight |
3 oz (85g) |
5.09 oz (144g) |
4.9 oz (139g) |
| Dimensions |
3.43" x 1.81" x 0.91" (87 x 46 x 23.1 mm) |
4.78" x 2.54" x 0.46" (121 x 64 x 11.7 mm) |
4.5" x 2.31" x 0.37" (114 x 59 x 9.4 mm) |
| Form Factor | Clamshell | Slab | Slab |
| Platform / OS | (proprietary) | Android | iOS |
| Network Bands |
GSM: 900, 1800, 1900 |
CDMA: 850, 1700, 1900 |
WCDMA: 1, 2, 5, 8 CDMA: 850, 1900 GSM: 850, 900, 1800, 1900 |
| Data Technology | GPRS | EVDO rA | HSPA 14.4 |
| Features | |||
| GPS / Location | - | n/a | n/a |
| Accessibility | |||
| Adjustable Text Size | - | n/a | n/a |
| Hearing Aid Compatible | - | - | Yes |
| Multiple Languages | Yes | n/a | n/a |
| TTY/TDD (Digital) | - | Yes | Yes |
| Connectivity | |||
| Bluetooth | - | Yes | Yes |
| Mobile Hotspot | - | n/a | n/a |
| USB | - |
Yes Micro-USB |
Yes |
| Wi-Fi | - | Yes |
Yes 4 (802.11 b,g,n) |
| Contacts | |||
| Picture ID | Yes | n/a | n/a |
| Ringer ID | Yes | n/a | n/a |
| Voice Dialing | - | n/a | n/a |
| Customization | |||
| Custom Graphics | Yes | n/a | n/a |
| Custom Ringtones | Yes | n/a | n/a |
| Real-Music Ringers | - | n/a | n/a |
| Data & Network | |||
| Data Tethering | - | n/a | n/a |
| WAP / Web Browser | Yes | n/a | n/a |
| Input | |||
| Predictive Text Entry | Yes | n/a | n/a |
| Side Keys | Yes | Yes | Yes |
| Touch Screen | - |
Yes Capacitive |
Yes Capacitive |
| Memory | |||
| Memory Card Slot | - | Yes | - |
| Messaging | |||
| Email Client | - | n/a | n/a |
| EMS / Picture Messaging | Yes | n/a | n/a |
| Instant Messaging | - | n/a | n/a |
| MMS | Yes | n/a | n/a |
| Text Messaging Templates | Yes | n/a | n/a |
| Music | |||
| Headphone Jack (3.5mm) | - | Yes | Yes |
| Music Player | - | n/a | n/a |
| Photo & Video | |||
| TV Output | - | - | Yes |
| Productivity | |||
| Alarm | Yes | n/a | n/a |
| Calculator | Yes | n/a | n/a |
| Calendar | Yes | n/a | n/a |
| To-Do List | Yes | n/a | n/a |
| Voice Memo | Yes | n/a | n/a |
| Software | |||
| Games | Yes | n/a | n/a |
| Java (J2ME) | Yes | n/a | n/a |
| Voice | |||
| Headset Jack (2.5 mm) | Yes | n/a | n/a |
| Speaker Phone | Yes | Yes | Yes |
| Samsung SGH-X640 | ZTE Engage LT / Engage MT | Apple iPhone 4S | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Samsung SGH-X640 | ZTE Engage LT / Engage MT | Apple iPhone 4S |
