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Phone Samsung SCH-A645 Samsung Messager III / R570 Samsung SPH-S100
Current U.S. Carriers (none) (none) (none)
Global Availability Released Released Not yet released
Specifications 
Display Size ? 2.4" diag.
4 : 3
?
Display Resolution & Type 128 x 160 pixels
LCD (STN)
240 x 320 pixels
(~167 ppi)
LCD (TFT/TFD)
?
Display Refresh ? ? ?
Battery 1,000 mAh 1,140 mAh ?
Processor ? ? ?
RAM ? ? ?
Storage ? raw hardware ? raw hardware ? raw hardware
Main Camera - 1 megapixel -
Wide Camera - - -
Tele Camera - - -
Video Capture - - -
Front Camera - - -
Weight 3.2 oz
(91g)
3.7 oz
(105g)
?
Dimensions 3.54" x 1.79" x 0.94"
(90 x 45 x 23.9 mm)
4.59" x 2.11" x 0.59"
(117 x 53 x 15 mm)
?
Form Factor Clamshell Slide Watch
Platform / OS (proprietary) (proprietary) (proprietary)
Network Bands

CDMA: 850, 1900

AMPS: 850

CDMA: 850, 1700, 1900

CDMA: 1900

Data Technology 1xRTT 1xRTT -
Features 
GPS / Location Yes Yes -
Accessibility
Hearing Aid Compatible Yes
M3 (mostly compatible)
Yes
M4, T3 (mostly tele-coil compatible)
-
Multiple Languages Yes Yes -
TTY/TDD (Digital) Yes Yes -
Alerts
Extra Display Yes - -
Connectivity
Bluetooth - Yes -
USB - Yes -
Contacts
Picture ID Yes Yes -
Ringer ID - Yes -
Voice Dialing Yes Yes -
Customization
Custom Graphics Yes Yes -
Custom Ringtones Yes Yes -
Real-Music Ringers - Yes -
Data & Network
WAP / Web Browser Yes * Yes -
Input
Predictive Text Entry Yes Yes -
Side Keys Yes Yes -
Text Keyboard, Hardware - Yes -
Memory
Memory Card Slot - Yes -
Messaging
EMS / Picture Messaging Yes - -
MMS - Yes -
Text Messaging Templates Yes Yes -
Music
Headphone Jack (3.5mm) - Yes -
Music Player - Yes -
Productivity
Alarm Yes Yes Yes
Calculator Yes Yes -
Calendar Yes Yes Yes
To-Do List Yes - Yes
Voice Memo Yes Yes -
Software
BREW Yes * Yes -
Games Yes * Yes -
Voice
Headset Jack (2.5 mm) Yes - Yes
Speaker Phone Yes Yes Yes
  * Some versions only
  Samsung SCH-A645 Samsung Messager III / R570 Samsung SPH-S100
  X > < X > < X

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

 
Phone Samsung SCH-A645 Samsung Messager III / R570 Samsung SPH-S100

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