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Phone Samsung SGH-X640 Pantech Duo C810 Ericsson T66
Current U.S. Carriers (none) (none) (none)
Global Availability 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
(~182 ppi)
LCD (TFT/TFD)
?
Display Refresh ? ? ?
Battery 800 mAh 1,320 mAh ?
Processor ? ARM 920t PXA27x ?
RAM ? ? ?
Storage ? raw hardware ? raw hardware ? raw hardware
Main Camera Yes 1 megapixel -
Wide Camera - - -
Tele Camera - - -
Video Capture - QVGA (320 x 240) -
Front Camera - - -
Weight 3 oz
(85g)
3.88 oz
(110g)
2.08 oz
(59g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
4.01" x 1.97" x 0.78"
(102 x 50 x 19.8 mm)
3.62" x 1.61" x 0.69"
(92 x 41 x 17.5 mm)
Form Factor Clamshell Slide Slab
Platform / OS (proprietary) Windows Mobile Standard (proprietary)
Network Bands

GSM: 900, 1800, 1900

WCDMA: 2, 5

GSM: 850, 900, 1800, 1900

GSM: 900, 1800, 1900

Data Technology GPRS HSDPA 1.8 -
Features 
Accessibility
Multiple Languages Yes n/a Yes
Alerts
Ringer Profiles - Yes Yes
Connectivity
Bluetooth - Yes -
USB - Yes -
Contacts
Picture ID Yes n/a -
Ringer ID Yes n/a -
Voice Dialing - n/a -
Customization
Custom Graphics Yes n/a Yes
Custom Ringtones Yes n/a Yes
Real-Music Ringers - n/a -
Data & Network
Data Tethering - n/a -
WAP / Web Browser Yes n/a Yes
Input
Predictive Text Entry Yes n/a Yes
Side Keys Yes Yes Yes
Text Keyboard, Hardware - Yes -
Memory
Memory Card Slot - Yes -
Messaging
Email Client - n/a -
EMS / Picture Messaging Yes n/a Yes
Instant Messaging - n/a -
MMS Yes n/a -
Text Messaging Templates Yes n/a Yes
Music
Music Player - n/a -
Productivity
Alarm Yes n/a Yes
Calculator Yes n/a Yes
Calendar Yes n/a Yes
To-Do List Yes n/a Yes
Voice Memo Yes n/a -
Software
Games Yes n/a Yes
Java (J2ME) Yes n/a -
Voice
Headset Jack (2.5 mm) Yes n/a -
Speaker Phone Yes Yes -
  Samsung SGH-X640 Pantech Duo C810 Ericsson T66
  X > < X > < X

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Phone Samsung SGH-X640 Pantech Duo C810 Ericsson T66

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