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Phone Nokia 6255i / 6256i Samsung M520 Motorola ROKR Z6 Samsung M400
Current U.S. Carriers (none) (none) (none) (none)
Global Availability Released Released Released Released
Specifications 
Display Size ? 2.1" diag.
4 : 3
? 2.4" diag.
4 : 3
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
176 x 220 pixels
(~134 ppi)
LCD (TFT/TFD)
240 x 320 pixels
LCD (TFT/TFD)
240 x 320 pixels
(~167 ppi)
LCD (TFT/TFD)
Display Refresh ? ? ? ?
Battery 1,070 mAh ? 750 mAh 1,000 mAh
Processor ? ? ? 400 MHz Qualcomm QSC6155
RAM ? ? ? 128 MB
Storage ? raw hardware ? raw hardware ? raw hardware 256 MB
Main Camera Yes 1 megapixel 2 megapixel 1 megapixel
Wide Camera - - - -
Tele Camera - - - -
Video Capture ? ? ? -
Front Camera - - - -
Weight 4.23 oz
(120g)
2.75 oz
(78g)
4.06 oz
(115g)
3.7 oz
(105g)
Dimensions 3.36" x 1.87" x 0.97"
(85 x 47 x 24.6 mm)
4.01" x 2.04" x 0.5"
(102 x 52 x 12.7 mm)
4.15" x 1.79" x 0.63"
(105 x 45 x 16 mm)
3.8" x 1.9" x 0.7"
(97 x 48 x 17.8 mm)
Form Factor Clamshell Slide Slide Clamshell
Platform / OS (proprietary) (proprietary) (proprietary) (proprietary)
Network Bands

CDMA: 850, 1900

AMPS: 850

CDMA: 850, 1900

GSM: 850, 900, 1800, 1900

CDMA: 800, 850, 1900

Data Technology 1xRTT EVDO r0 EDGE 1xRTT
Features 
GPS / Location Yes Yes - Yes
Accessibility
Adjustable Text Size - - - Yes
Hearing Aid Compatible Yes
M4 (very compatible)
Yes
M4 (very compatible)
- Yes
M4, T4 (very tele-coil compatible)
Multiple Languages Yes Yes Yes Yes
TTY/TDD (Digital) Yes Yes Yes Yes
Alerts
Extra Display Yes - - Yes
Ringer Profiles Yes - Yes -
Connectivity
Bluetooth Yes Yes Yes Yes
Infrared (IR) Yes - - -
USB Yes 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 Yes
Side Keys Yes Yes Yes Yes
Memory
Memory Card Slot Yes Yes Yes -
Messaging
Email Client Yes - Yes -
EMS / Picture Messaging Yes * - Yes -
Instant Messaging - - Yes -
MMS Yes - Yes Yes
Text Messaging Templates Yes Yes Yes Yes
Music
FM Radio Yes - - -
Headphone Jack (3.5mm) - - - Yes
Music Player Yes * Yes Yes -
Productivity
Alarm Yes Yes Yes Yes
Calculator Yes Yes Yes Yes
Calendar Yes Yes Yes Yes
To-Do List Yes Yes Yes -
Voice Memo Yes Yes Yes Yes
Software
BREW Yes * - - -
Games Yes Yes Yes Yes
Java (J2ME) Yes * Yes Yes -
Voice
Headset Jack (2.5 mm) Yes - - -
Speaker Phone Yes Yes Yes Yes
  * Some versions only
  Nokia 6255i / 6256i Samsung M520 Motorola ROKR Z6 Samsung M400
  X > < X > < X > < X

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

 
Phone Nokia 6255i / 6256i Samsung M520 Motorola ROKR Z6 Samsung M400

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