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Phone Siemens SL55 BlackBerry 7750 Samsung SCH-A570
Current U.S. Carriers (none) (none) (none)
Global Availability Released Released Released
Specifications 
Display Size ? ? ?
Display Resolution & Type 101 x 80 pixels
LCD (STN)
240 x 240 pixels
LCD (Color)
128 x 160 pixels
LCD (STN)
Display Refresh ? ? ?
Battery 500 mAh ? ?
Processor ? ? ?
RAM ? ? ?
Storage ? raw hardware ? raw hardware ? raw hardware
Main Camera - - -
Wide Camera - - -
Tele Camera - - -
Video Capture - - -
Front Camera - - -
Weight 2.79 oz
(79g)
5.01 oz
(142g)
3.6 oz
(102g)
Dimensions 3.21" x 1.75" x 0.86"
(82 x 44 x 21.8 mm)
4.76" x 3.03" x 0.71"
(121 x 77 x 18 mm)
3.3" x 1.8" x 0.9"
(84 x 46 x 22.9 mm)
Form Factor Slide Slab Clamshell
Platform / OS (proprietary) BlackBerry OS (proprietary)
Network Bands

GSM: 900, 1800, 1900

CDMA: 850, 1900

CDMA: 850, 1900

Data Technology GPRS 1xRTT 1xRTT
Features 
GPS / Location - n/a Yes
Accessibility
Multiple Languages Yes n/a Yes
TTY/TDD (Digital) - Yes Yes
Alerts
Extra Display - - Yes
Ringer Profiles Yes Yes -
Connectivity
Infrared (IR) Yes - -
USB - Yes -
Contacts
Picture ID Yes n/a -
Ringer ID Yes n/a -
Voice Dialing Yes n/a Yes
Customization
Custom Graphics Yes n/a Yes
Custom Ringtones Yes n/a Yes
Data & Network
Data Tethering Yes 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 -
Messaging
Email Client Yes n/a -
EMS / Picture Messaging Yes n/a Yes
MMS Yes n/a -
Text Messaging Templates Yes n/a Yes
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 Yes
Software
BREW - n/a Yes
Games Yes n/a Yes
Java (J2ME) Yes n/a -
Voice
Headset Jack (2.5 mm) - n/a Yes
Speaker Phone Yes - -
  Siemens SL55 BlackBerry 7750 Samsung SCH-A570
  X > < X > < X

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Phone Siemens SL55 BlackBerry 7750 Samsung SCH-A570

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