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Phone Samsung SGH-X820 Red Hydrogen One Siemens CF75 Pantech Duo C810 Pantech Flex
Current U.S. Carriers (none) (none) (none) (none) (none)
Global Availability Released Released Not yet released Released Released
Specifications 
Display Size ? 5.7" diag.
16 : 9
? 2.2" diag.
4 : 3
4.3" diag.
16 : 9
Display Resolution & Type 220 x 176 pixels
LCD (TFT/TFD)
1440 x 2560 pixels
(~515 ppi)
LCD (TFT/TFD)
128 x 160 pixels
LCD (STN)
240 x 320 pixels
(~182 ppi)
LCD (TFT/TFD)
540 x 960 pixels
(~256 ppi)
AMOLED
Display Refresh ? 60 Hz ? ? 60 Hz
Battery 650 mAh 4,510 mAh 600 mAh 1,320 mAh 1,830 mAh
Processor ? 2.5 GHz Qualcomm Snapdragon 835 (MSM8998) ? ARM 920t PXA27x 1.5 GHz Qualcomm Snapdragon S4 Plus MSM8960
RAM ? 6 GB ? ? 1 GB
Storage ? raw hardware 128 GB * ? raw hardware ? raw hardware 8 GB
Main Camera 2 megapixel 12 megapixel Yes 1 megapixel 8 megapixel
Wide Camera - - - - -
Tele Camera - - - - -
Video Capture ? 4K UHD - QVGA (320 x 240) 1080p HD
Front Camera - 8 megapixel - - 2 megapixel
Weight 2.33 oz
(66g)
9.63 oz
(273g)
3.17 oz
(90g)
3.88 oz
(110g)
4.66 oz
(132g)
Dimensions 4.45" x 1.97" x 0.27"
(113 x 50 x 6.9 mm)
6.54" x 3.28" x 0.39"
(166 x 83 x 10 mm)
3.43" x 1.73" x 1.26"
(87 x 44 x 32 mm)
4.01" x 1.97" x 0.78"
(102 x 50 x 19.8 mm)
5.11" x 2.63" x 0.31"
(130 x 67 x 7.9 mm)
Form Factor Slab Slab Clamshell Slide Slab
Platform / OS (proprietary) Android (proprietary) Windows Mobile Standard Android
Network Bands

GSM: 900, 1800, 1900

4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 29, 30, 38, 39, 40, 41, 66

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

CDMA: 800, 850, 1900

GSM: 850, 900, 1800, 1900

GSM: 900, 1800, 1900

WCDMA: 2, 5

GSM: 850, 900, 1800, 1900

4G LTE: 2, 4, 5, 17

WCDMA: 1, 2, 5

GSM: 850, 900, 1800, 1900

Data Technology EDGE LTE (Cat 12) EDGE HSDPA 1.8 LTE (Cat 3)
Features 
Fingerprint Reader - Yes
stand-alone
- - -
Flashlight - Yes - - -
GPS / Location - n/a - n/a n/a
Accessibility
Hearing Aid Compatible - Yes - - Yes
Multiple Languages Yes n/a Yes n/a n/a
TTY/TDD (Digital) - Yes - - Yes
Alerts
Extra Display - - Yes - -
Ringer Profiles - - - Yes -
Connectivity
Bluetooth Yes
Classic Audio
Yes
Classic Audio
-
Yes
Classic Audio
Yes
Classic Audio
Infrared (IR) - - Yes - -
Mobile Hotspot - n/a - n/a n/a
NFC - Yes - - -
USB Yes Yes
USB Type C
Yes Yes Yes
Micro-USB
Wi-Fi - Yes
5 (802.11 a,ac,b,g,n)
- - Yes
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
Customization
Custom Graphics Yes n/a Yes n/a n/a
Custom Ringtones Yes n/a Yes n/a n/a
Real-Music Ringers Yes n/a - n/a n/a
Data & Network
Data Tethering - n/a Yes n/a n/a
External Antenna Jack Yes n/a - n/a n/a
WAP / Web Browser Yes n/a Yes n/a n/a
Input
Predictive Text Entry Yes n/a Yes n/a n/a
Side Keys Yes Yes Yes Yes Yes
Text Keyboard, Hardware - - - Yes -
Touch Screen - Yes - - Yes
Memory
Memory Card Slot - Yes - Yes Yes
Messaging
Email Client Yes n/a Yes n/a n/a
EMS / Picture Messaging Yes n/a Yes n/a n/a
Instant Messaging - n/a - n/a n/a
MMS Yes n/a Yes n/a n/a
Text Messaging Templates Yes n/a Yes n/a n/a
Music
FM Radio - Yes - - -
Headphone Jack (3.5mm) - Yes - - Yes
Music Player - n/a - n/a n/a
Stereo Speakers - Yes - - -
Photo & Video
DLNA - - - - Yes
TV Output Yes - - - -
Power
Fast Charging - Yes - - -
Productivity
Alarm Yes n/a Yes n/a n/a
Calculator Yes n/a Yes n/a n/a
Calendar Yes n/a Yes n/a n/a
To-Do List Yes n/a Yes n/a n/a
Voice Memo Yes n/a Yes n/a n/a
Software
Games Yes n/a Yes n/a n/a
Java (J2ME) Yes n/a Yes n/a n/a
Voice
HD Voice - Yes - - -
Push-To-Talk - - Yes - -
Speaker Phone Yes Yes Yes Yes Yes
  Samsung SGH-X820 Red Hydrogen One Siemens CF75 Pantech Duo C810 Pantech Flex
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Phone Samsung SGH-X820 Red Hydrogen One Siemens CF75 Pantech Duo C810 Pantech Flex

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