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Phone ZTE Speed Samsung SCH-A990 LG K4 / Optimus Zone 3 / Rebel Samsung SGH-X640
Current U.S. Carriers (none) (none) (none) (none)
Global Availability Released Released Released Released
Specifications 
Display Size 4.5" diag.
16 : 9
? 4.5" diag.
16 : 9
?
Display Resolution & Type 540 x 960 pixels
(~245 ppi)
LCD (TFT/TFD)
240 x 320 pixels
LCD (TFT/TFD)
480 x 854 pixels
(~218 ppi)
LCD (TFT/TFD)
128 x 160 pixels
LCD (TFT/TFD)
Display Refresh 60 Hz ? 60 Hz ?
Battery 2,000 mAh 1,000 mAh 1,940 mAh 800 mAh
Processor 1.2 GHz Qualcomm Snapdragon 410 MSM8916 ? 1.1 GHz Qualcomm Snapdragon 210 (MSM8909) ?
RAM 1 GB ? 1.5 GB ?
Storage 8 GB ? raw hardware 16 GB * ? raw hardware
Main Camera 5 megapixel 3 megapixel 5 megapixel Yes
Wide Camera - - - -
Tele Camera - - - -
Video Capture 720p HD ? 720p HD -
Front Camera 2 megapixel - 2 megapixel -
Weight 4.8 oz
(136g)
4.4 oz
(125g)
3.99 oz
(113g)
3 oz
(85g)
Dimensions 5.3" x 2.6" x 0.4"
(135 x 66 x 10.2 mm)
3.8" x 1.88" x 0.82"
(97 x 48 x 20.8 mm)
5.19" x 2.62" x 0.35"
(132 x 67 x 8.9 mm)
3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
Form Factor Slab Clamshell Slab Clamshell
Platform / OS Android (proprietary) Android (proprietary)
Network Bands

4G LTE: 25, 26, 41

CDMA: 800, 850, 1900

CDMA: 850, 1900

4G LTE: 2, 4, 5, 13

WCDMA: 1, 2, 5

CDMA: 850, 1900

GSM: 850, 900, 1800, 1900

*

GSM: 900, 1800, 1900

Data Technology LTE (Cat 3) EVDO r0 LTE (Cat 3) GPRS
Features 
Flashlight - Yes Yes -
GPS / Location n/a Yes n/a -
Accessibility
Adjustable Text Size n/a - n/a -
Hearing Aid Compatible Yes
M3, T4 (very tele-coil compatible)
Yes
M3 (mostly compatible)
Yes
M3, T3 (mostly tele-coil compatible)
-
Multiple Languages n/a Yes n/a Yes
TTY/TDD (Digital) Yes Yes Yes -
Alerts
Extra Display - Yes - -
Connectivity
Bluetooth Yes Yes Yes -
Mobile Hotspot n/a - n/a -
USB Yes
Micro-USB
Yes Yes
Micro-USB
-
Wi-Fi Yes
4 (802.11 b,g,n)
- Yes
4 (802.11 b,g,n)
-
Contacts
Picture ID n/a Yes n/a Yes
Ringer ID n/a Yes n/a Yes
Voice Dialing n/a Yes n/a -
Customization
Custom Graphics n/a Yes n/a Yes
Custom Ringtones n/a Yes n/a Yes
Real-Music Ringers n/a Yes n/a -
Data & Network
Data Tethering n/a Yes n/a -
WAP / Web Browser n/a Yes n/a Yes
Input
Predictive Text Entry n/a Yes n/a Yes
Side Keys Yes Yes Yes Yes
Touch Screen Yes
Capacitive
- Yes
Capacitive
-
Memory
Memory Card Slot Yes Yes Yes -
Messaging
Email Client n/a - n/a -
EMS / Picture Messaging n/a Yes n/a Yes
Instant Messaging n/a - n/a -
MMS n/a Yes n/a Yes
Text Messaging Templates n/a Yes n/a Yes
Music
Headphone Jack (3.5mm) Yes - Yes -
Music Player n/a Yes n/a -
Stereo Speakers - Yes - -
Photo & Video
Miracast - - Yes -
TV Output - Yes - -
Productivity
Alarm n/a Yes n/a Yes
Calculator n/a Yes n/a Yes
Calendar n/a Yes n/a Yes
To-Do List n/a - n/a Yes
Voice Memo n/a Yes n/a Yes
Software
BREW n/a Yes n/a -
Games n/a Yes n/a Yes
Java (J2ME) n/a - n/a Yes
Voice
HD Voice Yes - Yes * -
Headset Jack (2.5 mm) n/a - n/a Yes
Speaker Phone Yes Yes Yes Yes
  * Some versions only
  ZTE Speed Samsung SCH-A990 LG K4 / Optimus Zone 3 / Rebel Samsung SGH-X640
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NOTE: Differences are highlighted with bold / black text for visual clarity only.

 
Phone ZTE Speed Samsung SCH-A990 LG K4 / Optimus Zone 3 / Rebel Samsung SGH-X640

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