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Phone Samsung SGH-X640 Samsung Galaxy S6 (GSM) Siemens A56 / A56i LG Volt 2
Current U.S. Carriers (none) (none) (none) (none)
Global Availability Released Released Released Released
Specifications 
Display Size ? 5.1" diag.
16 : 9
? 5" diag.
16 : 9
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
1440 x 2560 pixels
(~576 ppi)
AMOLED
101 x 64 pixels 720 x 1280 pixels
(~294 ppi)
LCD (TFT/TFD)
Display Refresh ? 60 Hz ? 60 Hz
Battery 800 mAh 2,550 mAh 700 mAh 2,540 mAh
Processor ? 2.1 GHz Samsung Exynos 7420 ? 1.2 GHz Qualcomm Snapdragon 410 (MSM8916)
RAM ? 3 GB ? 1 GB
Storage ? raw hardware 32 GB * ? raw hardware 8 GB
Main Camera Yes 16 megapixel - 8 megapixel
Wide Camera - - - -
Tele Camera - - - -
Video Capture - 4K UHD - 1080p HD
Front Camera - 5 megapixel - 5 megapixel
Weight 3 oz
(85g)
4.87 oz
(138g)
3 oz
(85g)
4.8 oz
(136g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
5.65" x 2.78" x 0.27"
(143 x 71 x 6.8 mm)
4" x 1.7" x 0.8"
(102 x 43 x 20.3 mm)
5.5" x 2.75" x 0.4"
(140 x 70 x 10.2 mm)
Form Factor Clamshell Slab Slab Slab
Platform / OS (proprietary) Android (proprietary) Android
Network Bands

GSM: 900, 1800, 1900

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

WCDMA: 1, 2, 5

GSM: 850, 900, 1800, 1900

*

GSM: 850, 1900

4G LTE: 2, 4, 5, 12, 25, 26, 41

CDMA: 800, 850, 1900

Data Technology GPRS LTE (Cat 6) - LTE (Cat 4)
Features 
Fingerprint Reader - Yes - -
Flashlight - Yes - -
GPS / Location - n/a Yes n/a
VR-ready - Yes - -
Accessibility
Adjustable Text Size - n/a - n/a
Hearing Aid Compatible - Yes
M3, T3 (mostly tele-coil compatible)
- Yes
M4, T4 (very tele-coil compatible)
Multiple Languages Yes n/a - n/a
TTY/TDD (Digital) - Yes Yes Yes
Alerts
Ringer Profiles - - Yes -
Connectivity
Bluetooth - Yes - Yes
Infrared (IR) - Yes - -
MirrorLink - Yes - -
Mobile Hotspot - n/a - n/a
NFC - Yes - -
USB - Yes
Micro-USB
- Yes
Micro-USB
Wi-Fi - Yes
5 (802.11 a,ac,b,g,n)
- Yes
4 (802.11 b,g,n)
Contacts
Picture ID Yes n/a Yes n/a
Ringer ID Yes n/a Yes n/a
Voice Dialing - n/a - n/a
Customization
Changeable Body Plates - - Yes -
Custom Graphics Yes n/a Yes n/a
Custom Ringtones Yes n/a Yes n/a
Real-Music Ringers - n/a - n/a
Data & Network
Data Tethering - n/a - n/a
WAP / Web Browser Yes n/a Yes n/a
Input
Predictive Text Entry Yes n/a Yes 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 Yes 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
Headphone Jack (3.5mm) - Yes - Yes
Music Player - n/a - n/a
Photo & Video
DLNA - Yes - Yes
Miracast - Yes - Yes
TV Output - Yes - Yes
Power
Fast Charging - Yes - -
Wireless Charging - Yes - -
Productivity
Alarm Yes n/a Yes n/a
Calculator Yes n/a Yes 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 Yes n/a
Java (J2ME) Yes n/a - n/a
Voice
HD Voice - Yes - Yes
Headset Jack (2.5 mm) Yes n/a - n/a
Speaker Phone Yes Yes - Yes
  Samsung SGH-X640 Samsung Galaxy S6 (GSM) Siemens A56 / A56i LG Volt 2
  X > < X > < X > < X

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

 
Phone Samsung SGH-X640 Samsung Galaxy S6 (GSM) Siemens A56 / A56i LG Volt 2

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