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Phone	HP iPAQ 510 Voice Messenger	Casio G'zOne Boulder	Visible Midnight	Nokia N81
Current U.S. Carriers	(none)	(none)	(none)	(none)
Global Availability	Released	Released	Released	Released
Display Size	2" diag. 4 : 3	2" diag. 4 : 3	6.5" diag. 20 : 9	2.4" diag. 4 : 3
Display Resolution & Type	176 x 220 pixels (~141 ppi) LCD (TFT/TFD)	240 x 320 pixels (~200 ppi) LCD (TFT/TFD)	720 x 1600 pixels (~269 ppi) LCD (TFT/TFD)	240 x 320 pixels (~167 ppi) LCD (TFT/TFD)
Display Refresh	?	?	60 Hz	?
Battery	1,100 mAh	810 mAh	4,000 mAh	1,050 mAh
Processor	200 MHz TI OMAP 850	?	MediaTek Helio P22 (MT6762)	369 MHz ARM 11
RAM	?	?	3 GB	?
Storage	? raw hardware	? raw hardware	32 GB	8 GB *
Main Camera	1 megapixel	1 megapixel	13 megapixel	2 megapixel
Wide Camera	-	-	5 megapixel	-
Tele Camera	-	-	-	-
Video Capture	QCIF (176 x 144)	?	1080p HD	VGA (640 x 480)
Front Camera	-	-	8 megapixel	-
Weight	3.6 oz (102g)	4.9 oz (139g)	6.35 oz (180g)	4.94 oz (140g)
Dimensions	4.21" x 1.91" x 0.64" (107 x 49 x 16.3 mm)	3.9" x 2" x 0.9" (99 x 51 x 22.9 mm)	6.53" x 3" x 0.34" (166 x 76 x 8.6 mm)	4.02" x 1.97" x 0.7" (102 x 50 x 17.8 mm)
Form Factor	Slab	Clamshell	Slab	Slide
Platform / OS	Windows Mobile Standard	(proprietary)	Android	S60 (Symbian)
Network Bands	GSM: 850, 900, 1800, 1900	CDMA: 850, 1900	4G LTE: 2, 4, 5, 7, 12, 13, 66	WCDMA: 1 GSM: 850, 900, 1800, 1900
Data Technology	EDGE	EVDO rA	LTE (Cat 4)	EDGE
Features
Fingerprint Reader	-	-	Yes stand-alone	-
Flashlight	-	Yes	Yes	-
GPS / Location	n/a	Yes	n/a	n/a
Ruggedized	-	Yes	-	-
Water-Resistant	-	Yes	-	-
Accessibility
Hearing Aid Compatible	-	Yes M4, T4 (very tele-coil compatible)	Yes M4, T3 (mostly tele-coil compatible)	-
Multiple Languages	n/a	Yes	n/a	n/a
TTY/TDD (Digital)	-	Yes	-	-
Alerts
Extra Display	-	Yes	-	-
Ringer Profiles	Yes	-	-	Yes
Connectivity
Bluetooth	Yes	Yes	Yes	Yes
USB	Yes Mini-USB	Yes	Yes USB Type C	Yes Micro-USB
Wi-Fi	Yes 802.11 b,g	-	Yes 5 (802.11 a,ac,b,g,n)	Yes 802.11 b,g
Contacts
Picture ID	n/a	Yes	n/a	n/a
Ringer ID	n/a	Yes	n/a	n/a
Voice Dialing	n/a	Yes	n/a	n/a
Customization
Changeable Body Plates	-	Yes	-	-
Custom Graphics	n/a	Yes	n/a	n/a
Custom Ringtones	n/a	Yes	n/a	n/a
Real-Music Ringers	n/a	-	n/a	n/a
Data & Network
Data Tethering	n/a	Yes	n/a	n/a
WAP / Web Browser	n/a	Yes	n/a	n/a
Input
Predictive Text Entry	n/a	Yes	n/a	n/a
Side Keys	Yes	Yes	Yes	Yes
Touch Screen	-	-	Yes Capacitive	-
Memory
Memory Card Slot	Yes	Yes	Yes	Yes *
Messaging
Email Client	n/a	-	n/a	n/a
EMS / Picture Messaging	n/a	Yes	n/a	n/a
Instant Messaging	n/a	-	n/a	n/a
MMS	n/a	Yes	n/a	n/a
Text Messaging Templates	n/a	Yes	n/a	n/a
Music
FM Radio	-	-	-	Yes
Headphone Jack (3.5mm)	-	-	Yes	Yes
Music Player	n/a	Yes	n/a	n/a
Stereo Speakers	-	-	-	Yes
Photo & Video
Video Calling	n/a	-	n/a	n/a
Power
Wireless Charging	-	-	Yes	-
Productivity
Alarm	n/a	Yes	n/a	n/a
Calculator	n/a	Yes	n/a	n/a
Calendar	n/a	Yes	n/a	n/a
To-Do List	n/a	-	n/a	n/a
Voice Memo	n/a	Yes	n/a	n/a
Software
BREW	n/a	Yes	n/a	n/a
Games	n/a	Yes	n/a	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
Push-To-Talk	-	Yes	-	Yes *
Speaker Phone	Yes	Yes	Yes	Yes
	* Some versions only
	HP iPAQ 510 Voice Messenger	Casio G'zOne Boulder	Visible Midnight	Nokia N81
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NOTE: Differences are highlighted with bold / black text for visual clarity only.


Phone	HP iPAQ 510 Voice Messenger	Casio G'zOne Boulder	Visible Midnight	Nokia N81