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Phone Samsung SGH-X400 Samsung SGH-X640 Samsung SGH-X820
Current U.S. Carriers (none) (none) (none)
Global Availability Released Released Released
Specifications 
Display Size ? ? ?
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
128 x 160 pixels
LCD (TFT/TFD)
220 x 176 pixels
LCD (TFT/TFD)
Display Refresh ? ? ?
Battery 620 mAh 800 mAh 650 mAh
Processor ? ? ?
RAM ? ? ?
Storage ? raw hardware ? raw hardware ? raw hardware
Main Camera - Yes 2 megapixel
Wide Camera - - -
Tele Camera - - -
Video Capture - - ?
Front Camera - - -
Weight 3.17 oz
(90g)
3 oz
(85g)
2.33 oz
(66g)
Dimensions 3.39" x 1.81" x 0.8"
(86 x 46 x 20.3 mm)
3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
4.45" x 1.97" x 0.27"
(113 x 50 x 6.9 mm)
Form Factor Clamshell Clamshell Slab
Platform / OS (proprietary) (proprietary) (proprietary)
Network Bands

GSM: 900, 1800, 1900

GSM: 900, 1800, 1900

GSM: 900, 1800, 1900

Data Technology GPRS GPRS EDGE
Features 
Accessibility
Multiple Languages Yes Yes Yes
Alerts
Extra Display Yes - -
Connectivity
Bluetooth - - Yes
Infrared (IR) Yes - -
USB - - Yes
Contacts
Picture ID Yes Yes Yes
Ringer ID Yes Yes Yes
Customization
Custom Graphics Yes Yes Yes
Custom Ringtones Yes Yes Yes
Real-Music Ringers - - Yes
Data & Network
External Antenna Jack - - Yes
WAP / Web Browser Yes Yes Yes
Input
Predictive Text Entry Yes Yes Yes
Side Keys Yes Yes Yes
Messaging
Email Client - - Yes
EMS / Picture Messaging Yes Yes Yes
MMS - Yes Yes
Text Messaging Templates Yes Yes Yes
Music
FM Radio Yes - -
Photo & Video
TV Output - - Yes
Productivity
Alarm Yes Yes Yes
Calculator Yes Yes Yes
Calendar Yes Yes Yes
To-Do List Yes Yes Yes
Voice Memo - Yes Yes
Software
Games Yes Yes Yes
Java (J2ME) Yes Yes Yes
Voice
Headset Jack (2.5 mm) Yes Yes -
Speaker Phone - Yes Yes
  Samsung SGH-X400 Samsung SGH-X640 Samsung SGH-X820
  X > < X > < X

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

 
Phone Samsung SGH-X400 Samsung SGH-X640 Samsung SGH-X820

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