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Phone	Siemens SX66 / MDA III / PDA2K (HTC Blue Angel)	LG VX-8500 Chocolate	AT&T Calypso	ZTE Z431 / Altair	HTC myTouch 4G Slide
Current U.S. Carriers	(none)	(none)	(none)	(none)	(none)
Global Availability	Released	Released	Released	Released	Released
Display Size	?	?	5.5" diag. 18 : 9	2.4" diag. 4 : 3	3.7" diag. 5 : 3
Display Resolution & Type	240 x 320 pixels LCD (TFT/TFD)	240 x 320 pixels LCD (TFT/TFD)	480 x 960 pixels (~195 ppi) LCD (TFT/TFD)	320 x 240 pixels (~167 ppi) LCD (TFT/TFD)	480 x 800 pixels (~252 ppi) LCD (TFT/TFD)
Display Refresh	?	?	60 Hz	?	60 Hz
Battery	1,490 mAh	800 mAh	2,500 mAh	1,000 mAh	1,520 mAh
Processor	400 MHz Intel XScale	?	1.5 GHz MediaTek MT6739	?	1.2 GHz Qualcomm Snapdragon S3 MSM8260 (dual-core)
RAM	?	?	1 GB	?	?
Storage	? raw hardware	? raw hardware	16 GB	? raw hardware	? raw hardware
Main Camera	Yes	1 megapixel	5 megapixel	2 megapixel	8 megapixel
Wide Camera	-	-	-	-	-
Tele Camera	-	-	-	-	-
Video Capture	QCIF (176 x 144)	QCIF (176 x 144)	1080p HD	QVGA (320 x 240)	1080p HD
Front Camera	-	-	5 megapixel	-	Yes
Weight	7.41 oz (210g)	3.53 oz (100g)	6 oz (170g)	3.52 oz (100g)	6.5 oz (184g)
Dimensions	4.92" x 2.83" x 0.75" (125 x 72 x 19.1 mm)	3.8" x 1.88" x 0.69" (97 x 48 x 17.5 mm)	5.91" x 2.87" x 0.39" (150 x 73 x 9.9 mm)	4.49" x 2.39" x 0.41" (114 x 61 x 10.4 mm)	4.8" x 2.4" x 0.52" (122 x 61 x 13.2 mm)
Form Factor	Slide	Slide	Slab	Slab	Slide
Platform / OS	Windows Mobile Professional	(proprietary)	Android	(proprietary)	Android
Network Bands	GSM: 850, 900, 1800, 1900	CDMA: 850, 1900	4G LTE: 2, 4, 5, 12, 14, 30 WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900	WCDMA: 1, 2, 5 GSM: 850, 900, 1800, 1900	WCDMA: 1, 4 GSM: 850, 900, 1800, 1900
Data Technology	GPRS	EVDO r0	LTE (Cat 4)	?	HSPA 14.4
Features
Flashlight	-	-	Yes	-	-
GPS / Location	n/a	Yes	n/a	Yes	n/a
Accessibility
Hearing Aid Compatible	-	Yes M3 (mostly compatible)	Yes M3, T4 (very tele-coil compatible)	Yes M3, T3 (mostly tele-coil compatible)	Yes M3, T3 (mostly tele-coil compatible)
Multiple Languages	n/a	Yes	n/a	Yes	n/a
TTY/TDD (Digital)	-	Yes	Yes	Yes	-
Alerts
Ringer Profiles	-	-	-	Yes	-
Connectivity
Bluetooth	Yes	Yes	Yes	Yes	Yes
Infrared (IR)	Yes	-	-	-	-
Mobile Hotspot	n/a	-	n/a	-	n/a
USB	Yes	-	Yes USB Type C	Yes Micro-USB	Yes
Wi-Fi	Yes	-	Yes 4 (802.11 b,g,n)	-	Yes 4 (802.11 b,g,n)
Contacts
Picture ID	n/a	Yes	n/a	Yes	n/a
Ringer ID	n/a	Yes	n/a	Yes	n/a
Voice Dialing	n/a	Yes	n/a	-	n/a
Customization
Custom Graphics	n/a	Yes	n/a	Yes	n/a
Custom Ringtones	n/a	Yes	n/a	Yes	n/a
Real-Music Ringers	n/a	Yes	n/a	Yes	n/a
Data & Network
Data Tethering	n/a	Yes	n/a	Yes	n/a
External Antenna Jack	n/a	Yes	n/a	-	n/a
WAP / Web Browser	n/a	Yes	n/a	Yes	n/a
Input
Predictive Text Entry	n/a	Yes	n/a	Yes	n/a
Side Keys	Yes	Yes	Yes	Yes	Yes
Text Keyboard, Hardware	Yes	-	-	Yes	Yes
Touch Screen	Yes	-	Yes Capacitive	-	Yes Capacitive
Memory
Memory Card Slot	Yes	Yes	Yes	Yes	Yes
Messaging
Email Client	n/a	-	n/a	Yes	n/a
Instant Messaging	n/a	-	n/a	-	n/a
MMS	n/a	Yes	n/a	Yes	n/a
Text Messaging Templates	n/a	Yes	n/a	Yes	n/a
Music
FM Radio	-	-	-	-	Yes
Headphone Jack (3.5mm)	-	-	Yes	Yes	Yes
Music Player	n/a	Yes	n/a	Yes	n/a
Photo & Video
DLNA	-	-	-	-	Yes
TV Output	-	-	-	-	Yes
Productivity
Alarm	n/a	Yes	n/a	Yes	n/a
Calculator	n/a	Yes	n/a	Yes	n/a
Calendar	n/a	Yes	n/a	Yes	n/a
To-Do List	n/a	-	n/a	-	n/a
Voice Memo	n/a	Yes	n/a	Yes	n/a
Software
BREW	n/a	Yes	n/a	Yes	n/a
Games	n/a	Yes	n/a	Yes	n/a
Java (J2ME)	n/a	-	n/a	-	n/a
Voice
HD Voice	-	-	Yes	-	-
Headset Jack (2.5 mm)	n/a	-	n/a	-	n/a
Speaker Phone	Yes	Yes *	Yes	Yes	Yes
	* Some versions only
	Siemens SX66 / MDA III / PDA2K (HTC Blue Angel)	LG VX-8500 Chocolate	AT&T Calypso	ZTE Z431 / Altair	HTC myTouch 4G Slide
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NOTE: Differences are highlighted with bold / black text for visual clarity only.


Phone	Siemens SX66 / MDA III / PDA2K (HTC Blue Angel)	LG VX-8500 Chocolate	AT&T Calypso	ZTE Z431 / Altair	HTC myTouch 4G Slide