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Phone Samsung SGH-X640 Sony Ericsson T68i Samsung SPH-Z400 Motorola Rival A455
Current U.S. Carriers (none) (none) (none) (none)
Global Availability Released Released Released Released
Specifications 
Display Size ? ? 1.9" diag.
4 : 3
2.2" diag.
4 : 3
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
101 x 80 pixels
LCD (STN)
176 x 220 pixels
(~150 ppi)
LCD (TFT/TFD)
176 x 220 pixels
(~131 ppi)
LCD (TFT/TFD)
Display Refresh ? ? ? ?
Battery 800 mAh 700 mAh 1,300 mAh 940 mAh
Processor ? ? ? ?
RAM ? ? ? ?
Storage ? raw hardware ? raw hardware ? raw hardware ? raw hardware
Main Camera Yes - 1 megapixel 2 megapixel
Wide Camera - - - -
Tele Camera - - - -
Video Capture - - QCIF (176 x 144) QVGA (320 x 240)
Front Camera - - - -
Weight 3 oz
(85g)
2.96 oz
(84g)
4.06 oz
(115g)
4.48 oz
(127g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
3.94" x 1.89" x 0.79"
(100 x 48 x 20.1 mm)
3.73" x 1.91" x 1"
(95 x 49 x 25.4 mm)
3.82" x 1.96" x 0.73"
(97 x 50 x 18.5 mm)
Form Factor Clamshell Slab Clamshell Slide
Platform / OS (proprietary) (proprietary) (proprietary) (proprietary)
Network Bands

GSM: 900, 1800, 1900

GSM: 900, 1800, 1900

CDMA: 850, 1900

CDMA: 850, 1900

Data Technology GPRS GPRS EVDO rA EVDO r0
Features 
GPS / Location - - Yes Yes
Ruggedized - - Yes -
Accessibility
Adjustable Text Size - - Yes -
Hearing Aid Compatible - - Yes
M4 (very compatible)
Yes
M3, T3 (mostly tele-coil compatible)
Multiple Languages Yes Yes Yes Yes
TTY/TDD (Digital) - - Yes Yes
Alerts
Extra Display - - Yes -
Ringer Profiles - Yes - -
Connectivity
Bluetooth - Yes Yes Yes
Infrared (IR) - Yes - -
USB - - Yes Yes
Micro-USB
Contacts
Picture ID Yes Yes Yes Yes
Ringer ID Yes Yes Yes Yes
Voice Dialing - Yes Yes Yes
Customization
Custom Graphics Yes Yes Yes Yes
Custom Ringtones Yes Yes Yes Yes
Real-Music Ringers - - Yes Yes
Data & Network
Data Tethering - Yes Yes Yes
WAP / Web Browser Yes Yes Yes Yes
Input
Predictive Text Entry Yes Yes Yes -
Side Keys Yes Yes Yes Yes
Text Keyboard, Hardware - - - Yes
Touch Screen - - - Yes
Memory
Memory Card Slot - - - Yes
Messaging
Email Client - Yes Yes Yes
EMS / Picture Messaging Yes Yes - Yes
Instant Messaging - - - Yes
MMS Yes Yes - Yes
Text Messaging Templates Yes Yes Yes Yes
Music
Headphone Jack (3.5mm) - - - Yes
Music Player - - - Yes
Stereo Speakers - - Yes -
Productivity
Alarm Yes Yes Yes Yes
Calculator Yes Yes Yes Yes
Calendar Yes Yes Yes Yes
To-Do List Yes Yes - -
Voice Memo Yes Yes Yes Yes
Software
BREW - - - Yes
Games Yes Yes Yes Yes
Java (J2ME) Yes - Yes -
Voice
Headset Jack (2.5 mm) Yes - Yes -
Push-To-Talk - - Yes -
Speaker Phone Yes - Yes Yes
  Samsung SGH-X640 Sony Ericsson T68i Samsung SPH-Z400 Motorola Rival A455
  X > < X > < X > < X

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

 
Phone Samsung SGH-X640 Sony Ericsson T68i Samsung SPH-Z400 Motorola Rival A455

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