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Phone Sony Ericsson T61c Samsung SGH-X640 Samsung SGH-A657
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)
176 x 220 pixels
LCD (TFT/TFD)
Display Refresh ? ? ?
Battery ? 800 mAh 1,420 mAh
Processor ? ? ?
RAM ? ? ?
Storage ? raw hardware ? raw hardware ? raw hardware
Main Camera - Yes -
Wide Camera - - -
Tele Camera - - -
Video Capture - - -
Front Camera - - -
Weight 4.4 oz
(125g)
3 oz
(85g)
4.34 oz
(123g)
Dimensions 4.8" x 2.13" x 0.92"
(122 x 54 x 23.4 mm)
3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
4.53" x 2.05" x 0.77"
(115 x 52 x 19.6 mm)
Form Factor Slab Clamshell Slab
Platform / OS (proprietary) (proprietary) (proprietary)
Network Bands

CDMA: 850, 1900

AMPS: 850

GSM: 900, 1800, 1900

WCDMA: 2, 5

GSM: 850, 900, 1800, 1900

Data Technology 1xRTT GPRS HSDPA 3.6
Features 
Flashlight - - Yes
GPS / Location Yes - Yes
Ruggedized - - Yes
Accessibility
Multiple Languages Yes Yes Yes
TTY/TDD (Digital) - - Yes
Alerts
Ringer Profiles Yes - -
Connectivity
Bluetooth Yes - Yes
USB - - Yes
Contacts
Picture ID - Yes Yes
Ringer ID - Yes Yes
Voice Dialing Yes - -
Customization
Changeable Body Plates Yes - -
Custom Graphics Yes Yes Yes
Custom Ringtones Yes Yes Yes
Real-Music Ringers - - Yes
Data & Network
Data Tethering Yes - Yes
WAP / Web Browser Yes Yes Yes
Input
Predictive Text Entry Yes Yes Yes
Side Keys Yes Yes Yes
Memory
Memory Card Slot - - Yes
Messaging
Email Client - - Yes
EMS / Picture Messaging Yes Yes -
Instant Messaging - - Yes
MMS - Yes Yes
Text Messaging Templates Yes Yes Yes
Music
Music Player - - Yes
Productivity
Alarm Yes Yes Yes
Calculator Yes Yes Yes
Calendar Yes Yes Yes
To-Do List - Yes Yes
Voice Memo Yes Yes Yes
Software
Games Yes Yes Yes
Java (J2ME) - Yes Yes
Voice
Headset Jack (2.5 mm) Yes Yes -
Push-To-Talk - - Yes
Speaker Phone - Yes Yes
  Sony Ericsson T61c Samsung SGH-X640 Samsung SGH-A657
  X > < X > < X

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Phone Sony Ericsson T61c Samsung SGH-X640 Samsung SGH-A657

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