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Phone Samsung SGH-X640 Samsung SCH-A990 Motorola i450 / i455 Motorola Rival A455
Current U.S. Carriers (none) (none) (none) (none)
Global Availability Released Released Released Released
Specifications 
Display Size ? ? ? 2.2" diag.
4 : 3
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
240 x 320 pixels
LCD (TFT/TFD)
130 x 130 pixels
LCD (STN)
176 x 220 pixels
(~131 ppi)
LCD (TFT/TFD)
Display Refresh ? ? ? ?
Battery 800 mAh 1,000 mAh ? 940 mAh
Processor ? ? ? ?
RAM ? ? ? ?
Storage ? raw hardware ? raw hardware ? raw hardware ? raw hardware
Main Camera Yes 3 megapixel - 2 megapixel
Wide Camera - - - -
Tele Camera - - - -
Video Capture - ? - QVGA (320 x 240)
Front Camera - - - -
Weight 3 oz
(85g)
4.4 oz
(125g)
4.5 oz
(128g)
4.48 oz
(127g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
3.8" x 1.88" x 0.82"
(97 x 48 x 20.8 mm)
3.5" x 2" x 1.1"
(89 x 51 x 27.9 mm)
3.82" x 1.96" x 0.73"
(97 x 50 x 18.5 mm)
Form Factor Clamshell Clamshell Clamshell Slide
Platform / OS (proprietary) (proprietary) (proprietary) (proprietary)
Network Bands

GSM: 900, 1800, 1900

CDMA: 850, 1900

iDEN: 800

CDMA: 850, 1900

Data Technology GPRS EVDO r0 - EVDO r0
Features 
Flashlight - Yes - -
GPS / Location - Yes Yes Yes
Accessibility
Hearing Aid Compatible - Yes
M3 (mostly compatible)
Yes
M3 (mostly compatible)
Yes
M3, T3 (mostly tele-coil compatible)
Multiple Languages Yes Yes Yes Yes
TTY/TDD (Digital) - Yes Yes Yes
Alerts
Extra Display - Yes Yes -
Ringer Profiles - - Yes -
Connectivity
Bluetooth - Yes - Yes
USB - Yes 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 * 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 - Yes
Messaging
Email Client - - - Yes
EMS / Picture Messaging Yes Yes - Yes
Instant Messaging - - - Yes
MMS Yes Yes Yes Yes
Text Messaging Templates Yes Yes Yes Yes
Music
Headphone Jack (3.5mm) - - - Yes
Music Player - Yes - Yes
Stereo Speakers - Yes - -
Photo & Video
TV Output - Yes - -
Productivity
Alarm Yes Yes - Yes
Calculator Yes Yes - Yes
Calendar Yes Yes Yes Yes
To-Do List Yes - - -
Voice Memo Yes Yes Yes Yes
Software
BREW - Yes - 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 Yes
  * Some versions only
  Samsung SGH-X640 Samsung SCH-A990 Motorola i450 / i455 Motorola Rival A455
  X > < X > < X > < X

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

 
Phone Samsung SGH-X640 Samsung SCH-A990 Motorola i450 / i455 Motorola Rival A455

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