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Phone Samsung SGH-X640 T-Mobile REVVL 4 ZTE Prelude / Avail 2 ZTE Imperial II Kyocera Coast / Kona
Current U.S. Carriers (none) (none) (none) (none) (none)
Global Availability Released Released Released Released Released
Specifications 
Display Size ? 6.2" diag.
19 : 9
3.5" diag.
5 : 3
5" diag.
16 : 9
2.4" diag.
4 : 3
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
720 x 1520 pixels
(~270 ppi)
LCD (TFT/TFD)
320 x 480 pixels
(~165 ppi)
LCD (TFT/TFD)
540 x 960 pixels
(~220 ppi)
LCD (TFT/TFD)
240 x 320 pixels
(~167 ppi)
LCD (TFT/TFD)
Display Refresh ? 60 Hz 60 Hz 60 Hz ?
Battery 800 mAh 3,500 mAh 1,500 mAh 2,300 mAh 870 mAh
Processor ? 2 GHz MediaTek Helio A22 (MT6761) 1 GHz Qualcomm Snapdragon MSM7225A 1.2 GHz Qualcomm Snapdragon 400 (MSM8926) 480 MHz Qualcomm QSC6155
RAM ? 2 GB 512 MB 1 GB 128 MB
Storage ? raw hardware 32 GB 4 GB 8 GB 256 MB
Main Camera Yes 13 megapixel 2 megapixel 5 megapixel 2 megapixel
Wide Camera - - - - -
Tele Camera - - - - -
Video Capture - 1080p HD VGA (640 x 480) 720p HD -
Front Camera - 5 megapixel - 1 megapixel -
Weight 3 oz
(85g)
5.59 oz
(158g)
4.4 oz
(125g)
5.07 oz
(144g)
3.7 oz
(105g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
6.26" x 2.99" x 0.32"
(159 x 76 x 8.1 mm)
4.6" x 2.44" x 0.45"
(117 x 62 x 11.4 mm)
5.6" x 2.8" x 0.4"
(142 x 71 x 10.2 mm)
3.94" x 2.05" x 0.68"
(100 x 52 x 17.3 mm)
Form Factor Clamshell Slab Slab Slab Clamshell
Platform / OS (proprietary) Android Android Android (proprietary)
Network Bands

GSM: 900, 1800, 1900

4G LTE: 2, 4, 5, 7, 12, 25, 26, 41, 66, 71

WCDMA: 2, 4, 5

CDMA: 800, 850, 1900

GSM: 850, 900, 1800, 1900

WCDMA: 2, 5

GSM: 850, 1900

4G LTE: 2, 4, 5, 12, 17

CDMA: 850, 1900

CDMA: 800, 850, 1700, 1900

*

Data Technology GPRS LTE (Cat 6) HSPA 7.2 LTE (Cat 3) 1xRTT
Features 
Fingerprint Reader - Yes
stand-alone
- - -
Flashlight - Yes - - -
GPS / Location - n/a n/a n/a Yes
Accessibility
Adjustable Text Size - n/a n/a n/a Yes
Hearing Aid Compatible - Yes
M3, T3 (mostly tele-coil compatible)
Yes
M3, T4 (very tele-coil compatible)
Yes
M4, T4 (very tele-coil compatible)
Yes
M4, T4 (very tele-coil compatible)
Multiple Languages Yes n/a n/a n/a Yes
TTY/TDD (Digital) - Yes Yes Yes Yes
Alerts
Extra Display - - - - Yes
Connectivity
Bluetooth - Yes Yes Yes Yes
Mobile Hotspot - n/a n/a n/a -
USB - Yes
USB Type C
Yes Yes
Micro-USB
Yes
Micro-USB
Wi-Fi - Yes
5 (802.11 a,ac,b,g,n)
Yes
4 (802.11 b,g,n)
Yes
4 (802.11 b,g,n)
-
Contacts
Picture ID Yes n/a n/a n/a Yes
Ringer ID Yes n/a n/a n/a Yes
Voice Dialing - n/a n/a n/a Yes
Customization
Custom Graphics Yes n/a n/a n/a Yes
Custom Ringtones Yes n/a n/a n/a Yes
Real-Music Ringers - n/a n/a n/a Yes
Data & Network
Data Tethering - n/a n/a n/a -
WAP / Web Browser Yes n/a n/a n/a Yes
Input
Predictive Text Entry Yes n/a n/a n/a Yes
Side Keys Yes Yes Yes Yes Yes
Touch Screen - Yes
Capacitive
Yes
Capacitive
Yes
Capacitive
-
Memory
Memory Card Slot - Yes Yes Yes -
Messaging
Email Client - n/a n/a n/a -
EMS / Picture Messaging Yes n/a n/a n/a -
Instant Messaging - n/a n/a n/a -
MMS Yes n/a n/a n/a Yes
Text Messaging Templates Yes n/a n/a n/a Yes
Music
FM Radio - Yes - - -
Headphone Jack (3.5mm) - Yes Yes Yes Yes
Music Player - n/a n/a n/a -
Productivity
Alarm Yes n/a n/a n/a Yes
Calculator Yes n/a n/a n/a Yes
Calendar Yes n/a n/a n/a Yes
To-Do List Yes n/a n/a n/a -
Voice Memo Yes n/a n/a n/a Yes
Software
Games Yes n/a n/a n/a Yes
Java (J2ME) Yes n/a n/a n/a Yes
Voice
HD Voice - Yes - - -
Headset Jack (2.5 mm) Yes n/a n/a n/a -
Speaker Phone Yes Yes Yes Yes Yes
  Samsung SGH-X640 T-Mobile REVVL 4 ZTE Prelude / Avail 2 ZTE Imperial II Kyocera Coast / Kona
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NOTE: Differences are highlighted with bold / black text for visual clarity only.

 
Phone Samsung SGH-X640 T-Mobile REVVL 4 ZTE Prelude / Avail 2 ZTE Imperial II Kyocera Coast / Kona

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