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| Phone | Siemens CT66 / C66 / C65 / C71 / C70 | HTC 8XT | Microsoft Lumia 640 |
| Current U.S. Carriers | (none) | (none) | (none) |
| Global Availability | Released | Released | Released |
| Specifications | |||
|---|---|---|---|
| Display Size | ? |
4.3" diag. 5 : 3 |
5" diag. 16 : 9 |
| Display Resolution & Type |
130 x 130 pixels LCD (Color) |
480 x 800 pixels (~217 ppi) LCD (TFT/TFD) |
720 x 1280 pixels (~294 ppi) LCD (TFT/TFD) |
| Display Refresh | ? | ? | ? |
| Battery | 600 mAh | 1,800 mAh | 2,500 mAh |
| Processor | ? | 1.4 GHz Qualcomm Snapdragon 400 8930 | 1.2 GHz Qualcomm Snapdragon 400 (MSM8926) |
| RAM | ? | 1 GB | 1 GB |
| Storage | ? raw hardware | 8 GB | 8 GB |
| Main Camera | Yes | 8 megapixel | 8 megapixel |
| Wide Camera | - | - | - |
| Tele Camera | - | - | - |
| Video Capture | - | 1080p HD | 1080p HD |
| Front Camera | - | 2 megapixel | 1 megapixel |
| Weight |
3 oz (85g) |
4.9 oz (139g) |
5.11 oz (145g) |
| Dimensions |
4.1" x 1.8" x 0.7" (104 x 46 x 17.8 mm) |
5.2" x 2.6" x 0.39" (132 x 66 x 9.9 mm) |
5.56" x 2.84" x 0.35" (141 x 72 x 8.9 mm) |
| Form Factor | Slab | Slab | Slab |
| Platform / OS | (proprietary) | Windows | Windows |
| Network Bands |
GSM: 850, 1800, 1900 |
4G LTE: 25 CDMA: 800, 850, 1900 |
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| Data Technology | GPRS | LTE (Cat 3) | LTE (Cat 4) |
| Features | |||
| Flashlight | - | Yes | - |
| GPS / Location | - | n/a | n/a |
| Accessibility | |||
| Adjustable Text Size | - | n/a | n/a |
| Hearing Aid Compatible | - |
Yes M4, T4 (very tele-coil compatible) |
Yes M3, T4 (very tele-coil compatible) |
| Multiple Languages | Yes | n/a | n/a |
| TTY/TDD (Digital) | - | Yes | Yes |
| Alerts | |||
| Ringer Profiles | Yes | - | - |
| Connectivity | |||
| Bluetooth | - | Yes | Yes |
| Infrared (IR) | Yes | - | - |
| Mobile Hotspot | - | n/a | n/a |
| NFC | - | Yes | Yes |
| USB | Yes |
Yes Micro-USB |
Yes Micro-USB |
| Wi-Fi | - |
Yes 4 (802.11 a,b,g,n) |
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 | |||
| Changeable Body Plates | Yes | - | - |
| 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 |
| Touch Screen | - |
Yes Capacitive |
Yes Capacitive |
| Memory | |||
| Memory Card Slot | - | Yes | 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 | |||
| FM Radio | - | Yes | Yes |
| Headphone Jack (3.5mm) | - | Yes | Yes |
| Music Player | - | n/a | n/a |
| Photo & Video | |||
| DLNA | - | - | Yes |
| Miracast | - | - | 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 | |||
| Call Screening | Yes | - | - |
| HD Voice | - | - | Yes |
| Push-To-Talk | Yes * | - | - |
| Speaker Phone | Yes | Yes | Yes |
| * Some versions only | |||
| Siemens CT66 / C66 / C65 / C71 / C70 | HTC 8XT | Microsoft Lumia 640 | |
NOTE: Differences are highlighted with bold / black text for visual clarity only.
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| Phone | Siemens CT66 / C66 / C65 / C71 / C70 | HTC 8XT | Microsoft Lumia 640 |
