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Phone Samsung SGH-X640 Nuu F4L Samsung SGH-X400
Current U.S. Carriers (none) (none) (none)
Global Availability Released Not yet released Released
Specifications 
Display Size ? 2.8" diag.
4 : 3
?
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
240 x 320 pixels
(~143 ppi)
LCD (STN)
128 x 160 pixels
LCD (TFT/TFD)
Display Refresh ? 60 Hz ?
Battery 800 mAh 1,350 mAh 620 mAh
Processor ? 1.1 GHz MediaTek MT6731 ?
RAM ? 512 MB ?
Storage ? raw hardware 4 GB ? raw hardware
Main Camera Yes 2 megapixel -
Wide Camera - - -
Tele Camera - - -
Video Capture - 720p HD -
Front Camera - Yes -
Weight 3 oz
(85g)
4.5 oz
(128g)
3.17 oz
(90g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
4.31" x 2.27" x 0.83"
(109 x 58 x 21 mm)
3.39" x 1.81" x 0.8"
(86 x 46 x 20.3 mm)
Form Factor Clamshell Clamshell Clamshell
Platform / OS (proprietary) (proprietary) (proprietary)
Network Bands

GSM: 900, 1800, 1900

4G LTE: 2, 4, 5, 12, 13, 66

WCDMA: 2, 4, 5

GSM: 850, 1900

GSM: 900, 1800, 1900

Data Technology GPRS LTE (Cat 4) GPRS
Features 
Flashlight - Yes -
GPS / Location - Yes -
Accessibility
Adjustable Text Size - Yes -
Hearing Aid Compatible - Yes
M4, T4 (very tele-coil compatible)
-
Multiple Languages Yes Yes Yes
TTY/TDD (Digital) - Yes -
Alerts
Extra Display - Yes Yes
Connectivity
Bluetooth - Yes -
Infrared (IR) - - Yes
USB - Yes
Micro-USB
-
Wi-Fi - Yes
4 (802.11 b,g,n)
-
Contacts
Picture ID Yes Yes Yes
Ringer ID Yes Yes Yes
Customization
Custom Graphics Yes Yes Yes
Custom Ringtones Yes - Yes
Data & Network
WAP / Web Browser Yes Yes Yes
Input
Predictive Text Entry Yes Yes Yes
Side Keys Yes Yes Yes
Memory
Memory Card Slot - Yes -
Messaging
Email Client - Yes -
EMS / Picture Messaging Yes - Yes
Instant Messaging - Yes -
MMS Yes Yes -
Text Messaging Templates Yes Yes Yes
Music
FM Radio - Yes Yes
Headphone Jack (3.5mm) - Yes -
Music Player - Yes -
Productivity
Alarm Yes Yes Yes
Calculator Yes Yes Yes
Calendar Yes Yes Yes
To-Do List Yes - Yes
Voice Memo Yes Yes -
Software
Games Yes - Yes
Java (J2ME) Yes - Yes
Voice
HD Voice - Yes -
Headset Jack (2.5 mm) Yes - Yes
Speaker Phone Yes Yes -
  Samsung SGH-X640 Nuu F4L Samsung SGH-X400
  X > < X > < X

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Phone Samsung SGH-X640 Nuu F4L Samsung SGH-X400

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