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Phone Samsung SGH-X640 Samsung Galaxy S6 (GSM) Nubia RedMagic 5S Nokia Lumia 635 (CDMA) Kyocera 3225
Current U.S. Carriers (none) (none) (none) (none) (none)
Global Availability Released Released Released Released Released
Specifications 
Display Size ? 5.1" diag.
16 : 9
6.7" diag.
19.5 : 9
4.5" diag.
16 : 9
?
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
1440 x 2560 pixels
(~576 ppi)
AMOLED
1080 x 2340 pixels
(~388 ppi)
AMOLED
480 x 854 pixels
(~218 ppi)
LCD (TFT/TFD)
?
LCD (Grayscale)
Display Refresh ? 60 Hz 144 Hz ? ?
Battery 800 mAh 2,550 mAh 4,500 mAh 1,830 mAh ?
Processor ? 2.1 GHz Samsung Exynos 7420 Qualcomm Snapdragon 865 1.2 GHz Qualcomm Snapdragon 400 (MSM8926) ?
RAM ? 3 GB 8 GB * 512 MB ?
Storage ? raw hardware 32 GB * 128 GB * 8 GB ? raw hardware
Main Camera Yes 16 megapixel 64 megapixel 5 megapixel -
Wide Camera - - 8 megapixel - -
Tele Camera - - - - -
Video Capture - 4K UHD 4K UHD 720p HD -
Front Camera - 5 megapixel 8 megapixel - -
Weight 3 oz
(85g)
4.87 oz
(138g)
7.76 oz
(220g)
4.73 oz
(134g)
4.23 oz
(120g)
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)
6.64" x 3.07" x 0.38"
(169 x 78 x 9.8 mm)
5.1" x 2.63" x 0.36"
(130 x 67 x 9.1 mm)
3.4" x 1.97" x 1.02"
(86 x 50 x 25.9 mm)
Form Factor Clamshell Slab Slab Slab Slab
Platform / OS (proprietary) Android Android Windows (proprietary)
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

*

5G: 41, 78

4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 18, 19, 20, 26, 34, 38, 40, 41

WCDMA: 1, 2, 4, 5, 8, 19

CDMA: 850, 1900

GSM: 850, 900, 1800, 1900

4G LTE: 25, 26, 41

WCDMA: 1, 2, 5

CDMA: 800, 850, 1900

GSM: 850, 900, 1800, 1900

CDMA: 850, 1900

AMPS: 850

Data Technology GPRS LTE (Cat 6) NR (5G) LTE (Cat 3) 1xRTT
Features 
Fingerprint Reader - Yes Yes - -
Flashlight - Yes Yes - -
GPS / Location - n/a n/a n/a Yes
VR-ready - Yes - - -
Accessibility
Hearing Aid Compatible - Yes - Yes -
Multiple Languages Yes n/a n/a n/a Yes
TTY/TDD (Digital) - Yes - Yes Yes
Connectivity
Bluetooth - Yes
Classic Audio
Yes
Classic Audio
Yes
Classic Audio
-
Infrared (IR) - Yes - - -
MirrorLink - Yes - - -
Mobile Hotspot - n/a n/a n/a -
NFC - Yes - - -
USB - Yes
Micro-USB
Yes
USB Type C
Yes
Micro-USB
-
Wi-Fi - Yes
5 (802.11 a,ac,b,g,n)
Yes
6 (802.11 a,ac,ax,b,g,n)
Yes
4 (802.11 b,g,n)
-
Contacts
Picture ID Yes n/a n/a n/a -
Ringer ID Yes n/a n/a n/a -
Voice Dialing - n/a n/a n/a Yes
Customization
Custom Graphics Yes n/a n/a n/a Yes
Custom Ringtones Yes n/a n/a n/a Yes
Real-Music Ringers - n/a n/a n/a -
Data & Network
Data Tethering - n/a n/a n/a Yes
Dual-SIM - - Yes - -
WAP / Web Browser Yes n/a n/a n/a Yes
Input
Predictive Text Entry Yes n/a n/a n/a Yes
Side Keys Yes Yes Yes Yes -
Touch Screen - Yes Yes Yes -
Memory
Memory Card Slot - - - Yes -
Messaging
Email Client - n/a n/a n/a -
EMS / Picture Messaging Yes n/a n/a n/a Yes
Instant Messaging - n/a n/a n/a -
MMS Yes n/a n/a n/a -
Text Messaging Templates Yes 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 -
Stereo Speakers - - Yes - -
Photo & Video
DLNA - Yes - Yes -
Miracast - Yes - - -
TV Output - Yes Yes - -
Power
Fast Charging - Yes Yes - -
Wireless Charging - Yes - - -
Productivity
Alarm Yes n/a n/a n/a Yes
Calculator Yes n/a n/a n/a Yes
Calendar Yes n/a n/a n/a Yes
To-Do List Yes n/a n/a n/a -
Voice Memo Yes n/a n/a n/a -
Software
BREW - n/a n/a n/a Yes
Games Yes n/a n/a n/a Yes
Java (J2ME) Yes n/a n/a n/a -
Voice
HD Voice - Yes - - -
Headset Jack (2.5 mm) Yes n/a n/a n/a Yes
Speaker Phone Yes Yes Yes Yes Yes
  * Some versions only
  Samsung SGH-X640 Samsung Galaxy S6 (GSM) Nubia RedMagic 5S Nokia Lumia 635 (CDMA) Kyocera 3225
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NOTE: Differences are highlighted with bold / black text for visual clarity only.

 
Phone Samsung SGH-X640 Samsung Galaxy S6 (GSM) Nubia RedMagic 5S Nokia Lumia 635 (CDMA) Kyocera 3225

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