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Phone Samsung SGH-X640 LG Stylo 4 Samsung Galaxy J2 / J2 Pure / J2 Dash BlackBerry 7750 LG G Flex (Sprint)
Current U.S. Carriers (none) (none) (none) (none) (none)
Global Availability Released Released Released Released Released
Specifications 
Display Size ? 6.2" diag.
18 : 9
5" diag.
16 : 9
? 6" diag.
16 : 9
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
1080 x 2160 pixels
(~390 ppi)
LCD (TFT/TFD)
540 x 960 pixels
(~220 ppi)
LCD (TFT/TFD)
240 x 240 pixels
LCD (Color)
720 x 1280 pixels
(~245 ppi)
AMOLED
Display Refresh ? 60 Hz 60 Hz ? 60 Hz
Battery 800 mAh 3,300 mAh 2,600 mAh ? 3,500 mAh
Processor ? 1.8 GHz Qualcomm Snapdragon 450 1.4 GHz Samsung Exynos 7570 ? 2.3 GHz Qualcomm Snapdragon 800 MSM8974
RAM ? 2 GB * 2 GB ? 2 GB
Storage ? raw hardware 32 GB * 16 GB ? raw hardware 32 GB
Main Camera Yes 13 megapixel 8 megapixel - 13 megapixel
Wide Camera - - - - -
Tele Camera - - - - -
Video Capture - 1080p HD 1080p HD - 4K UHD
Front Camera - 5 megapixel 5 megapixel - 2 megapixel
Weight 3 oz
(85g)
6.07 oz
(172g)
5.43 oz
(154g)
5.01 oz
(142g)
6.24 oz
(177g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
6.31" x 3.06" x 0.33"
(160 x 78 x 8.4 mm)
5.65" x 2.84" x 0.35"
(144 x 72 x 8.9 mm)
4.76" x 3.03" x 0.71"
(121 x 77 x 18 mm)
6.32" x 3.21" x 0.31"
(161 x 82 x 7.9 mm)
Form Factor Clamshell Slab Slab Slab Slab
Platform / OS (proprietary) Android Android BlackBerry OS Android
Network Bands

GSM: 900, 1800, 1900

4G LTE: 1, 2, 3, 4, 5, 7, 12, 13, 14, 20, 29, 30, 38, 41, 66, 71

WCDMA: 1, 2, 4, 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

*

CDMA: 850, 1900

4G LTE: 25, 26, 41

WCDMA: 1, 2, 5

CDMA: 800, 850, 1900

GSM: 850, 900, 1800, 1900

Data Technology GPRS LTE (Cat 6) LTE (Cat 4) 1xRTT LTE (Cat 4)
Features 
Fingerprint Reader - Yes
stand-alone
- - -
Flashlight - Yes Yes - Yes
GPS / Location - n/a n/a n/a n/a
Accessibility
Adjustable Text Size - n/a n/a n/a n/a
Hearing Aid Compatible - Yes
M4, T3 (mostly tele-coil compatible)
Yes
M3, T3 (mostly tele-coil compatible)
- Yes
M3, T3 (mostly tele-coil compatible)
Multiple Languages Yes n/a n/a n/a n/a
TTY/TDD (Digital) - Yes Yes Yes Yes
Alerts
Ringer Profiles - - - Yes -
Connectivity
Bluetooth - Yes Yes - Yes
Infrared (IR) - - - - Yes
Mobile Hotspot - n/a n/a n/a n/a
NFC - Yes * - - Yes
USB - Yes
USB Type C
Yes
Micro-USB
Yes Yes
Micro-USB
Wi-Fi - Yes
5 (802.11 a,ac,b,g,n)
Yes
4 (802.11 b,g,n)
- Yes
5 (802.11 a,ac,b,g,n)
Contacts
Picture ID Yes n/a n/a n/a n/a
Ringer ID Yes n/a n/a n/a n/a
Voice Dialing - n/a n/a n/a n/a
Customization
Custom Graphics Yes n/a n/a n/a n/a
Custom Ringtones Yes n/a n/a n/a n/a
Real-Music Ringers - n/a n/a n/a n/a
Data & Network
Data Tethering - n/a n/a n/a n/a
WAP / Web Browser Yes n/a n/a n/a n/a
Input
Predictive Text Entry Yes n/a n/a n/a n/a
Side Keys Yes Yes Yes Yes Yes
Stylus - Yes - - -
Text Keyboard, Hardware - - - Yes -
Touch Screen - Yes
Capacitive
Yes
Capacitive
- Yes
Capacitive
Memory
Memory Card Slot - Yes Yes - -
Messaging
Email Client - n/a n/a n/a n/a
EMS / Picture Messaging Yes n/a n/a n/a n/a
Instant Messaging - n/a n/a n/a n/a
MMS Yes n/a n/a n/a n/a
Text Messaging Templates Yes n/a n/a n/a n/a
Music
FM Radio - Yes - - -
Headphone Jack (3.5mm) - Yes Yes - Yes
Music Player - n/a n/a n/a n/a
Photo & Video
DLNA - Yes - - Yes
Miracast - - - - Yes
TV Output - - - - Yes
Productivity
Alarm Yes n/a n/a n/a n/a
Calculator Yes n/a n/a n/a n/a
Calendar Yes n/a n/a n/a n/a
To-Do List Yes n/a n/a n/a n/a
Voice Memo Yes n/a n/a n/a n/a
Software
Games Yes n/a n/a n/a n/a
Java (J2ME) Yes n/a n/a n/a n/a
Voice
HD Voice - Yes - - Yes
Headset Jack (2.5 mm) Yes n/a n/a n/a n/a
Speaker Phone Yes Yes Yes - Yes
  * Some versions only
  Samsung SGH-X640 LG Stylo 4 Samsung Galaxy J2 / J2 Pure / J2 Dash BlackBerry 7750 LG G Flex (Sprint)
  X > < X > < X > < X > < X

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

 
Phone Samsung SGH-X640 LG Stylo 4 Samsung Galaxy J2 / J2 Pure / J2 Dash BlackBerry 7750 LG G Flex (Sprint)

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