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Phone	Nokia N81	Microsoft Lumia 550	HTC Amaze 4G	Motorola i50sx	ZTE Aspect
Current U.S. Carriers	(none)	(none)	(none)	(none)	(none)
Global Availability	Released	Released	Released	Released	Released
Display Size	2.4" diag. 4 : 3	4.7" diag. 16 : 9	4.3" diag. 16 : 9	?	2.4" diag. 4 : 3
Display Resolution & Type	240 x 320 pixels (~167 ppi) LCD (TFT/TFD)	720 x 1280 pixels (~312 ppi) LCD (TFT/TFD)	540 x 960 pixels (~256 ppi) LCD (TFT/TFD)	? LCD (Grayscale)	320 x 240 pixels (~167 ppi) LCD (TFT/TFD)
Display Refresh	?	?	60 Hz	?	?
Battery	1,050 mAh	2,100 mAh	1,730 mAh	750 mAh	1,000 mAh
Processor	369 MHz ARM 11	1.1 GHz Qualcomm Snapdragon 210 (MSM8909)	1.5 GHz Qualcomm Snapdragon S3 dual-core	?	230 MHz Qualcomm QSC6270
RAM	?	1 GB	1 GB	?	128 MB
Storage	8 GB *	8 GB	16 GB	? raw hardware	256 MB
Main Camera	2 megapixel	5 megapixel	8 megapixel	-	2 megapixel
Wide Camera	-	-	-	-	-
Tele Camera	-	-	-	-	-
Video Capture	VGA (640 x 480)	720p HD	1080p HD	-	QVGA (320 x 240)
Front Camera	-	2 megapixel	2 megapixel	-	-
Weight	4.94 oz (140g)	5.01 oz (142g)	6.1 oz (173g)	5.1 oz (145g)	3.7 oz (105g)
Dimensions	4.02" x 1.97" x 0.7" (102 x 50 x 17.8 mm)	5.36" x 2.67" x 0.39" (136 x 68 x 9.9 mm)	5.12" x 2.58" x 0.46" (130 x 66 x 11.7 mm)	5.24" x 2.05" x 1.18" (133 x 52 x 30 mm)	4.55" x 2.4" x 0.45" (116 x 61 x 11.4 mm)
Form Factor	Slide	Slab	Slab	Slab	Slab
Platform / OS	S60 (Symbian)	Windows	Android	(proprietary)	(proprietary)
Network Bands	WCDMA: 1 GSM: 850, 900, 1800, 1900	4G LTE: 2, 4, 5, 7, 12, 17 WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900	WCDMA: 1, 2, 4, 5 GSM: 850, 900, 1800, 1900	iDEN: 800	WCDMA: 2, 4 GSM: 850, 900, 1800, 1900
Data Technology	EDGE	LTE (Cat 4)	HSPA+ 42	-	WCDMA (UMTS)
Features
Flashlight	-	Yes	Yes	-	-
GPS / Location	n/a	n/a	n/a	-	Yes
Accessibility
Adjustable Text Size	n/a	n/a	n/a	-	-
Hearing Aid 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	n/a	n/a	Yes	Yes
TTY/TDD (Digital)	-	Yes	Yes	Yes	Yes
Alerts
Ringer Profiles	Yes	-	-	-	Yes
Connectivity
Bluetooth	Yes	Yes	Yes	-	Yes
Mobile Hotspot	n/a	n/a	n/a	-	-
NFC	-	-	Yes	-	-
USB	Yes Micro-USB	Yes Micro-USB	Yes	-	Yes Micro-USB
Wi-Fi	Yes 802.11 b,g	Yes 4 (802.11 b,g,n)	Yes 4 (802.11 a,b,g,n)	-	-
Contacts
Picture ID	n/a	n/a	n/a	-	Yes
Ringer ID	n/a	n/a	n/a	-	Yes
Voice Dialing	n/a	n/a	n/a	Yes	-
Customization
Changeable Body Plates	-	-	-	Yes	-
Custom Graphics	n/a	n/a	n/a	-	Yes
Custom Ringtones	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	Yes	-
WAP / Web Browser	n/a	n/a	n/a	Yes	Yes
Input
Predictive Text Entry	n/a	n/a	n/a	Yes	Yes
Side Keys	Yes	Yes	Yes	Yes	Yes
Text Keyboard, Hardware	-	-	-	-	Yes
Touch Screen	-	Yes Capacitive	Yes Capacitive	-	-
Memory
Memory Card Slot	Yes *	Yes	Yes	-	Yes
Messaging
Email Client	n/a	n/a	n/a	-	Yes
Instant Messaging	n/a	n/a	n/a	-	-
MMS	n/a	n/a	n/a	-	Yes
Text Messaging Templates	n/a	n/a	n/a	-	Yes
Music
FM Radio	Yes	Yes	Yes	-	-
Headphone Jack (3.5mm)	Yes	Yes	Yes	-	Yes
Music Player	n/a	n/a	n/a	-	Yes
Stereo Speakers	Yes	-	-	-	-
Photo & Video
DLNA	-	-	Yes	-	-
TV Output	-	-	Yes	-	-
Video Calling	n/a	n/a	n/a	-	-
Productivity
Alarm	n/a	n/a	n/a	Yes	Yes
Calculator	n/a	n/a	n/a	-	Yes
Calendar	n/a	n/a	n/a	Yes	Yes
To-Do List	n/a	n/a	n/a	-	-
Voice Memo	n/a	n/a	n/a	-	Yes
Software
Games	n/a	n/a	n/a	-	Yes
Java (J2ME)	n/a	n/a	n/a	-	Yes
Voice
HD Voice	-	Yes	-	-	-
Headset Jack (2.5 mm)	n/a	n/a	n/a	Yes	-
Push-To-Talk	Yes *	-	-	Yes	-
Speaker Phone	Yes	Yes	Yes	-	Yes
	* Some versions only
	Nokia N81	Microsoft Lumia 550	HTC Amaze 4G	Motorola i50sx	ZTE Aspect
	X >	< X >	< X >	< X >	< X

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


Phone	Nokia N81	Microsoft Lumia 550	HTC Amaze 4G	Motorola i50sx	ZTE Aspect