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Phone Samsung SGH-X640 Samsung SGH-A657 Samsung Galaxy J2 / J2 Pure / J2 Dash
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)
176 x 220 pixels
LCD (TFT/TFD)
540 x 960 pixels
(~220 ppi)
LCD (TFT/TFD)
Display Refresh ? ? 60 Hz
Battery 800 mAh 1,420 mAh 2,600 mAh
Processor ? ? 1.4 GHz Samsung Exynos 7570
RAM ? ? 2 GB
Storage ? raw hardware ? raw hardware 16 GB
Main Camera Yes - 8 megapixel
Wide Camera - - -
Tele Camera - - -
Video Capture - - 1080p HD
Front Camera - - 5 megapixel
Weight 3 oz
(85g)
4.34 oz
(123g)
5.43 oz
(154g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
4.53" x 2.05" x 0.77"
(115 x 52 x 19.6 mm)
5.65" x 2.84" x 0.35"
(144 x 72 x 8.9 mm)
Form Factor Clamshell Slab Slab
Platform / OS (proprietary) (proprietary) Android
Network Bands

GSM: 900, 1800, 1900

WCDMA: 2, 5

GSM: 850, 900, 1800, 1900

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

WCDMA: 2, 4, 5

GSM: 850, 900, 1800, 1900

*

Data Technology GPRS HSDPA 3.6 LTE (Cat 4)
Features 
Flashlight - Yes Yes
GPS / Location - Yes n/a
Ruggedized - Yes -
Accessibility
Hearing Aid Compatible - - Yes
M3, T3 (mostly tele-coil compatible)
Multiple Languages Yes Yes n/a
TTY/TDD (Digital) - Yes Yes
Connectivity
Bluetooth - Yes Yes
USB - Yes Yes
Micro-USB
Wi-Fi - - Yes
4 (802.11 b,g,n)
Contacts
Picture ID Yes Yes n/a
Ringer ID Yes Yes n/a
Customization
Custom Graphics Yes Yes n/a
Custom Ringtones Yes Yes n/a
Real-Music Ringers - Yes n/a
Data & Network
Data Tethering - Yes n/a
WAP / Web Browser Yes Yes n/a
Input
Predictive Text Entry Yes Yes n/a
Side Keys Yes Yes Yes
Touch Screen - - Yes
Capacitive
Memory
Memory Card Slot - Yes Yes
Messaging
Email Client - Yes n/a
EMS / Picture Messaging Yes - n/a
Instant Messaging - Yes n/a
MMS Yes Yes n/a
Text Messaging Templates Yes Yes n/a
Music
Headphone Jack (3.5mm) - - Yes
Music Player - Yes n/a
Productivity
Alarm Yes Yes n/a
Calculator Yes Yes n/a
Calendar Yes Yes n/a
To-Do List Yes Yes n/a
Voice Memo Yes Yes n/a
Software
Games Yes Yes n/a
Java (J2ME) Yes Yes n/a
Voice
Headset Jack (2.5 mm) Yes - n/a
Push-To-Talk - Yes -
Speaker Phone Yes Yes Yes
  Samsung SGH-X640 Samsung SGH-A657 Samsung Galaxy J2 / J2 Pure / J2 Dash
  X > < X > < X

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

 
Phone Samsung SGH-X640 Samsung SGH-A657 Samsung Galaxy J2 / J2 Pure / J2 Dash

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