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Phone	Nokia Lumia 521 / 520	BlackBerry Storm2 9550	Samsung Galaxy Attain 4G
Current U.S. Carriers	(none)	(none)	(none)
Global Availability	Released	Released	Released
Display Size	4" diag. 5 : 3	3.3" diag. 4 : 3	3.5" diag. 5 : 3
Display Resolution & Type	480 x 800 pixels (~233 ppi) LCD (TFT/TFD)	360 x 480 pixels (~185 ppi) LCD (TFT/TFD)	320 x 480 pixels (~165 ppi) LCD (TFT/TFD)
Display Refresh	?	?	60 Hz
Battery	1,430 mAh	1,400 mAh	1,650 mAh
Processor	1 GHz Qualcomm Snapdragon S4 MSM8270	?	?
RAM	512 MB	?	512 MB
Storage	8 GB	? raw hardware	? raw hardware
Main Camera	5 megapixel	3 megapixel	3 megapixel
Wide Camera	-	-	-
Tele Camera	-	-	-
Video Capture	720p HD	?	WVGA / 480p
Front Camera	-	-	1 megapixel
Weight	4.39 oz (124g)	5.64 oz (160g)	4.2 oz (119g)
Dimensions	4.72" x 2.52" x 0.39" (120 x 64 x 9.9 mm)	4.43" x 2.45" x 0.55" (113 x 62 x 14 mm)	4.57" x 2.38" x 0.46" (116 x 60 x 11.7 mm)
Platform / OS	Windows	BlackBerry OS	Android
Network Bands	WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900 *	WCDMA: 1 CDMA: 850, 1900 GSM: 850, 900, 1800, 1900	4G LTE: 2, 4 CDMA: 850, 1700, 1900
Data Technology	HSPA+ 21	EVDO rA	LTE (Cat 3)
Features
Accessibility
Hearing Aid Compatible	Yes	Yes	Yes
TTY/TDD (Digital)	Yes	Yes	Yes
Alerts
Ringer Profiles	-	Yes	-
Connectivity
Bluetooth	Yes	Yes Classic Audio	Yes Classic Audio
USB	Yes	Yes	Yes Micro-USB
Wi-Fi	Yes	Yes 802.11 b,g	Yes
Input
Side Keys	Yes	Yes	Yes
Touch Screen	Yes	Yes	Yes
Memory
Memory Card Slot	Yes	Yes	Yes
Music
Headphone Jack (3.5mm)	Yes	Yes	Yes
Photo & Video
DLNA	-	-	Yes
Voice
Speaker Phone	Yes	Yes	Yes
	Nokia Lumia 521 / 520	BlackBerry Storm2 9550	Samsung Galaxy Attain 4G
	X >	< X >	< X

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


Phone	Nokia Lumia 521 / 520	BlackBerry Storm2 9550	Samsung Galaxy Attain 4G