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Phone	Nokia Lumia 521 / 520	HTC SDA (USA) / SP5m (Tornado)	ZTE Avid 4	Samsung SCH-A990	Motorola Defy (2010)
Current U.S. Carriers	(none)	(none)	(none)	(none)	(none)
Global Availability	Released	Released	Released	Released	Released
Display Size	4" diag. 5 : 3	2.2" diag. 4 : 3	5" diag. 16 : 9	?	3.6" diag. 16 : 9
Display Resolution & Type	480 x 800 pixels (~233 ppi) LCD (TFT/TFD)	240 x 320 pixels (~182 ppi) LCD (TFT/TFD)	480 x 854 pixels (~196 ppi) LCD (TFT/TFD)	240 x 320 pixels LCD (TFT/TFD)	480 x 854 pixels (~272 ppi) LCD (TFT/TFD)
Display Refresh	?	?	60 Hz	?	60 Hz
Battery	1,430 mAh	?	2,520 mAh	1,000 mAh	1,540 mAh
Processor	1 GHz Qualcomm Snapdragon S4 MSM8270	?	1.1 GHz Qualcomm Snapdragon 210 (MSM8909)	?	800 MHz TI OMAP3610
RAM	512 MB	?	2 GB	?	?
Storage	8 GB	? raw hardware	16 GB	? raw hardware	? raw hardware
Main Camera	5 megapixel	1 megapixel	8 megapixel	3 megapixel	5 megapixel
Wide Camera	-	-	-	-	-
Tele Camera	-	-	-	-	-
Video Capture	720p HD	QCIF (176 x 144)	720p HD	?	?
Front Camera	-	-	5 megapixel	-	-
Weight	4.39 oz (124g)	3.74 oz (106g)	5.6 oz (159g)	4.4 oz (125g)	4.16 oz (118g)
Dimensions	4.72" x 2.52" x 0.39" (120 x 64 x 9.9 mm)	4.53" x 1.82" x 0.69" (115 x 46 x 17.5 mm)	5.7" x 2.8" x 0.36" (145 x 71 x 9.1 mm)	3.8" x 1.88" x 0.82" (97 x 48 x 20.8 mm)	4.21" x 2.32" x 0.53" (107 x 59 x 13.4 mm)
Form Factor	Slab	Slab	Slab	Clamshell	Slab
Platform / OS	Windows	Windows Mobile Standard	Android	(proprietary)	Android
Network Bands	WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900 *	GSM: 850, 900, 1800, 1900	4G LTE: 2, 4, 5, 12, 66 WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900	CDMA: 850, 1900	WCDMA: 1, 4, 5 GSM: 850, 900, 1800, 1900
Data Technology	HSPA+ 21	EDGE	LTE (Cat 4)	EVDO r0	HSPA 7.2
Features
Flashlight	-	-	Yes	Yes	-
GPS / Location	n/a	n/a	n/a	Yes	n/a
Ruggedized	-	-	-	-	Yes
Accessibility
Hearing Aid Compatible	Yes M3, T4 (very tele-coil compatible)	-	Yes M4, T3 (mostly tele-coil compatible)	Yes M3 (mostly compatible)	-
Multiple Languages	n/a	n/a	n/a	Yes	n/a
TTY/TDD (Digital)	Yes	Yes	Yes	Yes	Yes
Alerts
Extra Display	-	-	-	Yes	-
Ringer Profiles	-	Yes	-	-	-
Connectivity
Bluetooth	Yes	Yes	Yes	Yes	Yes
Infrared (IR)	-	Yes	-	-	-
Mobile Hotspot	n/a	n/a	n/a	-	n/a
USB	Yes	Yes Mini-USB	Yes Micro-USB	Yes	Yes Micro-USB
Wi-Fi	Yes	Yes	Yes 4 (802.11 b,g,n)	-	Yes 4 (802.11 b,g,n)
Contacts
Picture ID	n/a	n/a	n/a	Yes	n/a
Ringer ID	n/a	n/a	n/a	Yes	n/a
Voice Dialing	n/a	n/a	n/a	Yes	n/a
Customization
Custom Graphics	n/a	n/a	n/a	Yes	n/a
Custom Ringtones	n/a	n/a	n/a	Yes	n/a
Real-Music Ringers	n/a	n/a	n/a	Yes	n/a
Data & Network
Data Tethering	n/a	n/a	n/a	Yes	n/a
External Antenna Jack	n/a	n/a	n/a	-	n/a
WAP / Web Browser	n/a	n/a	n/a	Yes	n/a
Input
Predictive Text Entry	n/a	n/a	n/a	Yes	n/a
Side Keys	Yes	Yes	Yes	Yes	Yes
Touch Screen	Yes Capacitive	-	Yes Capacitive	-	Yes Capacitive
Memory
Memory Card Slot	Yes	Yes	Yes	Yes	Yes
Messaging
Email Client	n/a	n/a	n/a	-	n/a
EMS / Picture Messaging	n/a	n/a	n/a	Yes	n/a
Instant Messaging	n/a	n/a	n/a	-	n/a
MMS	n/a	n/a	n/a	Yes	n/a
Text Messaging Templates	n/a	n/a	n/a	Yes	n/a
Music
FM Radio	-	-	Yes	-	Yes
Headphone Jack (3.5mm)	Yes	-	Yes	-	Yes
Music Player	n/a	n/a	n/a	Yes	n/a
Stereo Speakers	-	-	-	Yes	-
Photo & Video
DLNA	-	-	-	-	Yes
TV Output	-	-	-	Yes	-
Productivity
Alarm	n/a	n/a	n/a	Yes	n/a
Calculator	n/a	n/a	n/a	Yes	n/a
Calendar	n/a	n/a	n/a	Yes	n/a
To-Do List	n/a	n/a	n/a	-	n/a
Voice Memo	n/a	n/a	n/a	Yes	n/a
Software
BREW	n/a	n/a	n/a	Yes	n/a
Games	n/a	n/a	n/a	Yes	n/a
Java (J2ME)	n/a	n/a	n/a	-	n/a
Voice
HD Voice	-	-	Yes	-	-
Headset Jack (2.5 mm)	n/a	n/a	n/a	-	n/a
Speaker Phone	Yes	Yes	Yes	Yes	Yes
	* Some versions only
	Nokia Lumia 521 / 520	HTC SDA (USA) / SP5m (Tornado)	ZTE Avid 4	Samsung SCH-A990	Motorola Defy (2010)
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NOTE: Differences are highlighted with bold / black text for visual clarity only.


Phone	Nokia Lumia 521 / 520	HTC SDA (USA) / SP5m (Tornado)	ZTE Avid 4	Samsung SCH-A990	Motorola Defy (2010)