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Phone Samsung SGH-X640 ZTE Engage LT / Engage MT Motorola Defy (2010) ZTE Avid 4
Current U.S. Carriers (none) (none) (none) (none)
Global Availability Released Released Released Released
Specifications 
Display Size ? 4" diag.
5 : 3
3.6" diag.
16 : 9
5" diag.
16 : 9
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
480 x 800 pixels
(~233 ppi)
LCD (TFT/TFD)
480 x 854 pixels
(~272 ppi)
LCD (TFT/TFD)
480 x 854 pixels
(~196 ppi)
LCD (TFT/TFD)
Display Refresh ? 60 Hz 60 Hz 60 Hz
Battery 800 mAh 1,900 mAh 1,540 mAh 2,520 mAh
Processor ? ? 800 MHz TI OMAP3610 1.1 GHz Qualcomm Snapdragon 210 (MSM8909)
RAM ? 1 GB ? 2 GB
Storage ? raw hardware 4 GB ? raw hardware 16 GB
Main Camera Yes 3 megapixel 5 megapixel 8 megapixel
Wide Camera - - - -
Tele Camera - - - -
Video Capture - WVGA / 480p ? 720p HD
Front Camera - Yes - 5 megapixel
Weight 3 oz
(85g)
5.09 oz
(144g)
4.16 oz
(118g)
5.6 oz
(159g)
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)
4.21" x 2.32" x 0.53"
(107 x 59 x 13.4 mm)
5.7" x 2.8" x 0.36"
(145 x 71 x 9.1 mm)
Form Factor Clamshell Slab Slab Slab
Platform / OS (proprietary) Android Android Android
Network Bands

GSM: 900, 1800, 1900

CDMA: 850, 1700, 1900

WCDMA: 1, 4, 5

GSM: 850, 900, 1800, 1900

4G LTE: 2, 4, 5, 12, 66

WCDMA: 2, 4, 5

GSM: 850, 900, 1800, 1900

Data Technology GPRS EVDO rA HSPA 7.2 LTE (Cat 4)
Features 
Flashlight - - - Yes
GPS / Location - n/a n/a n/a
Ruggedized - - Yes -
Accessibility
Adjustable Text Size - n/a n/a n/a
Hearing Aid Compatible - - - Yes
M4, T3 (mostly tele-coil compatible)
Multiple Languages Yes n/a n/a n/a
TTY/TDD (Digital) - Yes Yes Yes
Connectivity
Bluetooth - Yes Yes Yes
USB - Yes
Micro-USB
Yes
Micro-USB
Yes
Micro-USB
Wi-Fi - Yes Yes
4 (802.11 b,g,n)
Yes
4 (802.11 b,g,n)
Contacts
Picture ID Yes n/a n/a n/a
Ringer ID Yes n/a n/a n/a
Voice Dialing - n/a n/a n/a
Customization
Custom Graphics Yes n/a n/a n/a
Custom Ringtones Yes n/a n/a n/a
Real-Music Ringers - n/a n/a n/a
Data & Network
Data Tethering - n/a n/a n/a
WAP / Web Browser Yes n/a n/a n/a
Input
Predictive Text Entry Yes n/a n/a n/a
Side Keys Yes Yes Yes Yes
Touch Screen - Yes
Capacitive
Yes
Capacitive
Yes
Capacitive
Memory
Memory Card Slot - Yes Yes Yes
Messaging
Email Client - n/a n/a n/a
EMS / Picture Messaging Yes n/a n/a n/a
Instant Messaging - n/a n/a n/a
MMS Yes n/a n/a n/a
Text Messaging Templates Yes n/a n/a n/a
Music
FM Radio - - Yes Yes
Headphone Jack (3.5mm) - Yes Yes Yes
Music Player - n/a n/a n/a
Photo & Video
DLNA - - Yes -
Productivity
Alarm Yes n/a n/a n/a
Calculator Yes n/a n/a n/a
Calendar Yes n/a n/a n/a
To-Do List Yes n/a n/a n/a
Voice Memo Yes n/a n/a n/a
Software
Games Yes n/a n/a n/a
Java (J2ME) Yes n/a n/a n/a
Voice
HD Voice - - - Yes
Headset Jack (2.5 mm) Yes n/a n/a n/a
Speaker Phone Yes Yes Yes Yes
  Samsung SGH-X640 ZTE Engage LT / Engage MT Motorola Defy (2010) ZTE Avid 4
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Phone Samsung SGH-X640 ZTE Engage LT / Engage MT Motorola Defy (2010) ZTE Avid 4

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