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Phone Samsung SGH-X640 Samsung Galaxy J2 / J2 Pure / J2 Dash LG G4020
Current U.S. Carriers (none) (none) (none)
Global Availability Released Released Released
Specifications 
Display Size ? 5" diag.
16 : 9
?
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
540 x 960 pixels
(~220 ppi)
LCD (TFT/TFD)
128 x 128 pixels
LCD (STN)
Display Refresh ? 60 Hz ?
Battery 800 mAh 2,600 mAh 760 mAh
Processor ? 1.4 GHz Samsung Exynos 7570 ?
RAM ? 2 GB ?
Storage ? raw hardware 16 GB ? raw hardware
Main Camera Yes 8 megapixel -
Wide Camera - - -
Tele Camera - - -
Video Capture - 1080p HD -
Front Camera - 5 megapixel -
Weight 3 oz
(85g)
5.43 oz
(154g)
3 oz
(85g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
5.65" x 2.84" x 0.35"
(144 x 72 x 8.9 mm)
3.19" x 1.69" x 0.82"
(81 x 43 x 20.8 mm)
Form Factor Clamshell Slab Clamshell
Platform / OS (proprietary) Android (proprietary)
Network Bands

GSM: 900, 1800, 1900

4G LTE: 2, 3, 4, 5, 7, 12, 14, 66, 71

WCDMA: 2, 4, 5

GSM: 850, 900, 1800, 1900

*

GSM: 850, 1900

Data Technology GPRS LTE (Cat 4) GPRS
Features 
Flashlight - Yes -
Accessibility
Hearing Aid Compatible - Yes
M3, T3 (mostly tele-coil compatible)
-
Multiple Languages Yes n/a Yes
TTY/TDD (Digital) - Yes Yes
Alerts
Extra Display - - Yes
Connectivity
Bluetooth - Yes -
USB - Yes
Micro-USB
-
Wi-Fi - Yes
4 (802.11 b,g,n)
-
Contacts
Picture ID Yes n/a Yes
Ringer ID Yes n/a Yes
Customization
Custom Graphics Yes n/a Yes
Custom Ringtones Yes n/a Yes
Data & Network
Data Tethering - n/a Yes
WAP / Web Browser Yes n/a Yes
Input
Predictive Text Entry Yes n/a Yes
Side Keys Yes Yes Yes
Touch Screen - Yes
Capacitive
-
Memory
Memory Card Slot - Yes -
Messaging
EMS / Picture Messaging Yes n/a Yes
MMS Yes n/a Yes
Text Messaging Templates Yes n/a Yes
Music
Headphone Jack (3.5mm) - Yes -
Productivity
Alarm Yes n/a Yes
Calculator Yes n/a Yes
Calendar Yes n/a Yes
To-Do List Yes n/a -
Voice Memo Yes n/a -
Software
Games Yes n/a Yes
Java (J2ME) Yes n/a Yes
Voice
Headset Jack (2.5 mm) Yes n/a Yes
Speaker Phone Yes Yes -
  Samsung SGH-X640 Samsung Galaxy J2 / J2 Pure / J2 Dash LG G4020
  X > < X > < X

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

 
Phone Samsung SGH-X640 Samsung Galaxy J2 / J2 Pure / J2 Dash LG G4020

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