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Phone Samsung SGH-X640 Motorola ROKR Z6 HTC Desire 555
Current U.S. Carriers (none) (none) (none)
Global Availability Released Released Released
Specifications 
Display Size ? ? 5" diag.
16 : 9
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
240 x 320 pixels
LCD (TFT/TFD)
720 x 1280 pixels
(~294 ppi)
LCD (TFT/TFD)
Display Refresh ? ? 60 Hz
Battery 800 mAh 750 mAh 2,200 mAh
Processor ? ? 1.1 GHz Qualcomm Snapdragon 210 (MSM8909)
RAM ? ? 2 GB
Storage ? raw hardware ? raw hardware 16 GB
Main Camera Yes 2 megapixel 8 megapixel
Wide Camera - - -
Tele Camera - - -
Video Capture - ? 720p HD
Front Camera - - 5 megapixel
Weight 3 oz
(85g)
4.06 oz
(115g)
4.93 oz
(140g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
4.15" x 1.79" x 0.63"
(105 x 45 x 16 mm)
5.78" x 2.79" x 0.33"
(147 x 71 x 8.4 mm)
Form Factor Clamshell Slide Slab
Platform / OS (proprietary) (proprietary) Android
Network Bands

GSM: 900, 1800, 1900

GSM: 850, 900, 1800, 1900

4G LTE: 2, 4, 5, 12

WCDMA: 2, 4, 5

GSM: 850, 900, 1800, 1900

Data Technology GPRS EDGE LTE (Cat 4)
Features 
Flashlight - - Yes
Accessibility
Hearing Aid Compatible - - Yes *
M4, T4 (very tele-coil compatible)
Multiple Languages Yes Yes n/a
TTY/TDD (Digital) - Yes Yes
Alerts
Ringer Profiles - Yes -
Connectivity
Bluetooth - Yes Yes
USB - Yes Yes
Micro-USB
Wi-Fi - - Yes
4 (802.11 b,g,n)
Contacts
Picture ID Yes Yes n/a
Ringer ID Yes Yes n/a
Customization
Custom Graphics Yes Yes n/a
Custom Ringtones Yes Yes n/a
Real-Music Ringers - Yes n/a
Data & Network
Data Tethering - Yes n/a
WAP / Web Browser Yes Yes n/a
Input
Predictive Text Entry Yes Yes n/a
Side Keys Yes Yes Yes
Touch Screen - - Yes
Capacitive
Memory
Memory Card Slot - Yes Yes
Messaging
Email Client - Yes n/a
EMS / Picture Messaging Yes Yes n/a
Instant Messaging - Yes n/a
MMS Yes Yes n/a
Text Messaging Templates Yes Yes n/a
Music
FM Radio - - Yes
Headphone Jack (3.5mm) - - Yes
Music Player - Yes n/a
Photo & Video
DLNA - - Yes
Miracast - - Yes
Productivity
Alarm Yes Yes n/a
Calculator Yes Yes n/a
Calendar Yes Yes n/a
To-Do List Yes Yes n/a
Voice Memo Yes Yes n/a
Software
Games Yes Yes n/a
Java (J2ME) Yes Yes n/a
Voice
HD Voice - - Yes
Headset Jack (2.5 mm) Yes - n/a
Speaker Phone Yes Yes Yes
  * Some versions only
  Samsung SGH-X640 Motorola ROKR Z6 HTC Desire 555
  X > < X > < X

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

 
Phone Samsung SGH-X640 Motorola ROKR Z6 HTC Desire 555

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