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Phone Samsung SGH-X640 Huawei Ascend XT Amazon Fire Samsung SCH-A570
Current U.S. Carriers (none) (none) (none) (none)
Global Availability Released Released Released Released
Specifications 
Display Size ? 6" diag.
16 : 9
4.7" diag.
16 : 9
?
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
720 x 1280 pixels
(~245 ppi)
LCD (TFT/TFD)
720 x 1280 pixels
(~312 ppi)
LCD (TFT/TFD)
128 x 160 pixels
LCD (STN)
Display Refresh ? 60 Hz ? ?
Battery 800 mAh 3,000 mAh 2,400 mAh ?
Processor ? 1.5 GHz Qualcomm Snapdragon 615 (MSM8939) 2.2 GHz Qualcomm Snapdragon 800 ?
RAM ? 2 GB 2 GB ?
Storage ? raw hardware 16 GB 32 GB * ? raw hardware
Main Camera Yes 8 megapixel 13 megapixel -
Wide Camera - - - -
Tele Camera - - - -
Video Capture - 720p HD 1080p HD -
Front Camera - 2 megapixel 2 megapixel -
Weight 3 oz
(85g)
7.27 oz
(206g)
5.64 oz
(160g)
3.6 oz
(102g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
6.45" x 3.3" x 0.35"
(164 x 84 x 8.9 mm)
5.5" x 2.6" x 0.35"
(140 x 66 x 8.9 mm)
3.3" x 1.8" x 0.9"
(84 x 46 x 22.9 mm)
Form Factor Clamshell Slab Slab Clamshell
Platform / OS (proprietary) Android (proprietary) (proprietary)
Network Bands

GSM: 900, 1800, 1900

4G LTE: 2, 4, 5, 12, 30

WCDMA: 1, 2, 5

GSM: 850, 900, 1800, 1900

4G LTE: 1, 2, 3, 4, 5, 7, 8, 17

WCDMA: 1, 2, 4, 5, 8

GSM: 850, 900, 1800, 1900

CDMA: 850, 1900

Data Technology GPRS LTE (Cat 4) LTE (Cat 4) 1xRTT
Features 
Flashlight - Yes Yes -
GPS / Location - n/a Yes Yes
Accessibility
Hearing Aid Compatible - Yes
M4, T4 (very tele-coil compatible)
Yes
M4, T4 (very tele-coil compatible)
-
Multiple Languages Yes n/a Yes Yes
TTY/TDD (Digital) - Yes Yes Yes
Alerts
Extra Display - - - Yes
Connectivity
Bluetooth - Yes Yes -
Mobile Hotspot - n/a Yes -
NFC - - Yes -
USB - Yes
Micro-USB
Yes
Micro-USB
-
Wi-Fi - Yes
4 (802.11 b,g,n)
Yes
5 (802.11 a,ac,b,g,n)
-
Contacts
Picture ID Yes n/a Yes -
Ringer ID Yes n/a Yes -
Voice Dialing - n/a Yes Yes
Customization
Custom Graphics Yes n/a - Yes
Custom Ringtones Yes n/a Yes Yes
Data & Network
Data Tethering - n/a Yes -
WAP / Web Browser Yes n/a Yes Yes
Input
Predictive Text Entry Yes n/a Yes Yes
Side Keys Yes Yes Yes Yes
Touch Screen - Yes
Capacitive
Yes
Capacitive
-
Memory
Memory Card Slot - Yes - -
Messaging
Email Client - n/a Yes -
EMS / Picture Messaging Yes n/a - Yes
MMS Yes n/a Yes -
Text Messaging Templates Yes n/a Yes Yes
Music
FM Radio - Yes - -
Headphone Jack (3.5mm) - Yes Yes -
Music Player - n/a Yes -
Stereo Speakers - - Yes -
Photo & Video
Miracast - - Yes -
TV Output - - Yes -
Productivity
Alarm Yes n/a Yes Yes
Calculator Yes n/a Yes Yes
Calendar Yes n/a Yes Yes
To-Do List Yes n/a - Yes
Voice Memo Yes n/a Yes Yes
Software
BREW - n/a - Yes
Games Yes n/a Yes Yes
Java (J2ME) Yes n/a - -
Voice
HD Voice - Yes Yes -
Headset Jack (2.5 mm) Yes n/a - Yes
Speaker Phone Yes Yes Yes -
  Samsung SGH-X640 Huawei Ascend XT Amazon Fire Samsung SCH-A570
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Phone Samsung SGH-X640 Huawei Ascend XT Amazon Fire Samsung SCH-A570

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