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Phone Samsung SGH-X640 Samsung Glyde U940 Samsung Galaxy S6 (GSM) Asus ZenFone 4 LG AX-490
Current U.S. Carriers (none) (none) (none) (none) (none)
Global Availability Released Released Released Released Released
Specifications 
Display Size ? 2.8" diag.
16.5 : 9
5.1" diag.
16 : 9
5.5" diag.
16 : 9
?
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
240 x 440 pixels
(~182 ppi)
LCD (TFT/TFD)
1440 x 2560 pixels
(~576 ppi)
AMOLED
1080 x 1920 pixels
(~401 ppi)
LCD (TFT/TFD)
128 x 160 pixels
LCD (TFT/TFD)
Display Refresh ? ? 60 Hz 60 Hz ?
Battery 800 mAh 1,000 mAh 2,550 mAh 3,300 mAh 1,100 mAh
Processor ? ? 2.1 GHz Samsung Exynos 7420 2.2 GHz Qualcomm Snapdragon 630 ?
RAM ? ? 3 GB 4 GB ?
Storage ? raw hardware ? raw hardware 32 GB * 64 GB ? raw hardware
Main Camera Yes 2 megapixel 16 megapixel 12 megapixel Yes
Wide Camera - - - Yes -
Tele Camera - - - - -
Video Capture - QVGA (320 x 240) 4K UHD 4K UHD -
Front Camera - - 5 megapixel 8 megapixel -
Weight 3 oz
(85g)
4.2 oz
(119g)
4.87 oz
(138g)
5.47 oz
(155g)
3.79 oz
(107g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
4.09" x 1.98" x 0.71"
(104 x 50 x 18 mm)
5.65" x 2.78" x 0.27"
(143 x 71 x 6.8 mm)
6.12" x 2.96" x 0.3"
(155 x 75 x 7.7 mm)
3.74" x 1.92" x 1"
(95 x 49 x 25.4 mm)
Form Factor Clamshell Slide Slab Slab Clamshell
Platform / OS (proprietary) (proprietary) Android Android (proprietary)
Network Bands

GSM: 900, 1800, 1900

CDMA: 850, 1900

4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 17, 20, 29, 30

WCDMA: 1, 2, 5

GSM: 850, 900, 1800, 1900

*

4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 17, 28

WCDMA: 1, 2, 4, 5, 8

GSM: 850, 900, 1800, 1900

CDMA: 850, 1900

AMPS: 850

Data Technology GPRS EVDO r0 LTE (Cat 6) LTE (Cat 12) 1xRTT
Features 
Fingerprint Reader - - Yes Yes
stand-alone
-
Flashlight - - Yes Yes -
GPS / Location - Yes n/a n/a Yes
VR-ready - - Yes - -
Accessibility
Hearing Aid Compatible - Yes
M4 (very compatible)
Yes
M3, T3 (mostly tele-coil compatible)
Yes
M4, T3 (mostly tele-coil compatible)
Yes
M3 (mostly compatible)
Multiple Languages Yes Yes n/a n/a Yes
TTY/TDD (Digital) - Yes Yes - Yes
Alerts
Extra Display - - - - Yes
Connectivity
Bluetooth - Yes Yes Yes Yes
Infrared (IR) - - Yes - -
MirrorLink - - Yes - -
NFC - - Yes Yes -
USB - Yes Yes
Micro-USB
Yes
USB Type C
Yes
Wi-Fi - - Yes
5 (802.11 a,ac,b,g,n)
Yes
5 (802.11 a,ac,b,g,n)
-
Contacts
Picture ID Yes Yes n/a n/a Yes
Ringer ID Yes Yes n/a n/a Yes
Voice Dialing - Yes n/a n/a Yes
Customization
Custom Graphics Yes Yes n/a n/a Yes
Custom Ringtones Yes Yes n/a n/a Yes
Real-Music Ringers - Yes n/a n/a Yes
Data & Network
Data Tethering - Yes n/a n/a Yes
Dual-SIM - - - Yes -
WAP / Web Browser Yes Yes n/a n/a Yes
Input
Predictive Text Entry Yes Yes n/a n/a -
Side Keys Yes Yes Yes Yes Yes
Text Keyboard, Hardware - Yes - - Yes
Touch Screen - Yes Yes
Capacitive
Yes
Capacitive
-
Memory
Memory Card Slot - Yes - Yes -
Messaging
EMS / Picture Messaging Yes - n/a n/a -
MMS Yes Yes n/a n/a Yes
Text Messaging Templates Yes Yes n/a n/a Yes
Music
Headphone Jack (3.5mm) - - Yes Yes -
Music Player - Yes n/a n/a -
Stereo Speakers - - - - Yes
Photo & Video
DLNA - - Yes - -
Miracast - - Yes Yes -
TV Output - - Yes - -
Power
Fast Charging - - Yes Yes -
Wireless Charging - - Yes - -
Productivity
Alarm Yes Yes n/a n/a Yes
Calculator Yes Yes n/a n/a Yes
Calendar Yes Yes n/a n/a Yes
To-Do List Yes - n/a n/a -
Voice Memo Yes - n/a n/a Yes
Software
BREW - Yes n/a n/a Yes
Games Yes Yes n/a n/a Yes
Java (J2ME) Yes - n/a n/a -
Voice
HD Voice - - Yes - -
Headset Jack (2.5 mm) Yes Yes n/a n/a Yes
Speaker Phone Yes Yes Yes Yes Yes
  Samsung SGH-X640 Samsung Glyde U940 Samsung Galaxy S6 (GSM) Asus ZenFone 4 LG AX-490
  X > < X > < X > < X > < X

NOTE: Differences are highlighted with bold / black text for visual clarity only.

 
Phone Samsung SGH-X640 Samsung Glyde U940 Samsung Galaxy S6 (GSM) Asus ZenFone 4 LG AX-490

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