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Phone	Samsung SGH-X640	HTC Desire 555	Samsung Galaxy S II Skyrocket	ZTE Prelude / Avail 2
Current U.S. Carriers	(none)	(none)	(none)	(none)
Global Availability	Released	Released	Released	Released
Display Size	?	5" diag. 16 : 9	4.5" diag. 5 : 3	3.5" diag. 5 : 3
Display Resolution & Type	128 x 160 pixels LCD (TFT/TFD)	720 x 1280 pixels (~294 ppi) LCD (TFT/TFD)	480 x 800 pixels (~207 ppi) AMOLED	320 x 480 pixels (~165 ppi) LCD (TFT/TFD)
Display Refresh	?	60 Hz	60 Hz	60 Hz
Battery	800 mAh	2,200 mAh	1,850 mAh	1,500 mAh
Processor	?	1.1 GHz Qualcomm Snapdragon 210 (MSM8909)	1.5 GHz Qualcomm Snapdragon S3 APQ8060	1 GHz Qualcomm Snapdragon MSM7225A
RAM	?	2 GB	1 GB	512 MB
Storage	? raw hardware	16 GB	16 GB	4 GB
Main Camera	Yes	8 megapixel	8 megapixel	2 megapixel
Wide Camera	-	-	-	-
Tele Camera	-	-	-	-
Video Capture	-	720p HD	1080p HD	VGA (640 x 480)
Front Camera	-	5 megapixel	2 megapixel	-
Weight	3 oz (85g)	4.93 oz (140g)	4.71 oz (133g)	4.4 oz (125g)
Dimensions	3.43" x 1.81" x 0.91" (87 x 46 x 23.1 mm)	5.78" x 2.79" x 0.33" (147 x 71 x 8.4 mm)	5.12" x 2.72" x 0.35" (130 x 69 x 9 mm)	4.6" x 2.44" x 0.45" (117 x 62 x 11.4 mm)
Form Factor	Clamshell	Slab	Slab	Slab
Platform / OS	(proprietary)	Android	Android	Android
Network Bands	GSM: 900, 1800, 1900	4G LTE: 2, 4, 5, 12 WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900	4G LTE: 4, 17 WCDMA: 1, 2, 5 GSM: 850, 900, 1800, 1900	WCDMA: 2, 5 GSM: 850, 1900
Data Technology	GPRS	LTE (Cat 4)	LTE (Cat 3)	HSPA 7.2
Features
Flashlight	-	Yes	-	-
GPS / Location	-	n/a	n/a	n/a
Accessibility
Adjustable Text Size	-	n/a	n/a	n/a
Hearing Aid Compatible	-	Yes * M4, T4 (very tele-coil compatible)	Yes M3 (mostly compatible)	Yes M3, T4 (very tele-coil compatible)
Multiple Languages	Yes	n/a	n/a	n/a
TTY/TDD (Digital)	-	Yes	Yes	Yes
Connectivity
Bluetooth	-	Yes	Yes	Yes
Mobile Hotspot	-	n/a	n/a	n/a
NFC	-	-	Yes	-
USB	-	Yes Micro-USB	Yes Micro-USB	Yes
Wi-Fi	-	Yes 4 (802.11 b,g,n)	Yes 4 (802.11 a,b,g,n)	Yes 4 (802.11 b,g,n)
Contacts
Picture ID	Yes	n/a	n/a	n/a
Ringer ID	Yes	n/a	n/a	n/a
Voice Dialing	-	n/a	n/a	n/a
Customization
Custom Graphics	Yes	n/a	n/a	n/a
Custom Ringtones	Yes	n/a	n/a	n/a
Real-Music Ringers	-	n/a	n/a	n/a
Data & Network
Data Tethering	-	n/a	n/a	n/a
WAP / Web Browser	Yes	n/a	n/a	n/a
Input
Predictive Text Entry	Yes	n/a	n/a	n/a
Side Keys	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
Text Messaging Templates	Yes	n/a	n/a	n/a
Music
FM Radio	-	Yes	-	-
Headphone Jack (3.5mm)	-	Yes	Yes	Yes
Music Player	-	n/a	n/a	n/a
Photo & Video
DLNA	-	Yes	Yes	-
Miracast	-	Yes	-	-
TV Output	-	-	Yes	-
Productivity
Alarm	Yes	n/a	n/a	n/a
Calculator	Yes	n/a	n/a	n/a
Calendar	Yes	n/a	n/a	n/a
To-Do List	Yes	n/a	n/a	n/a
Voice Memo	Yes	n/a	n/a	n/a
Software
Games	Yes	n/a	n/a	n/a
Java (J2ME)	Yes	n/a	n/a	n/a
Voice
HD Voice	-	Yes	-	-
Headset Jack (2.5 mm)	Yes	n/a	n/a	n/a
Speaker Phone	Yes	Yes	Yes	Yes
	* Some versions only
	Samsung SGH-X640	HTC Desire 555	Samsung Galaxy S II Skyrocket	ZTE Prelude / Avail 2
	X >	< X >	< X >	< X

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


Phone	Samsung SGH-X640	HTC Desire 555	Samsung Galaxy S II Skyrocket	ZTE Prelude / Avail 2