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Phone	BlackBerry 7750	Samsung SPH-i550	Nokia Lumia 521 / 520
Current U.S. Carriers	(none)	(none)	(none)
Global Availability	Released	Not yet released	Released
Display Size	?	?	4" diag. 5 : 3
Display Resolution & Type	240 x 240 pixels LCD (Color)	320 x 320 pixels LCD (TFT/TFD)	480 x 800 pixels (~233 ppi) LCD (TFT/TFD)
Display Refresh	?	?	?
Battery	?	?	1,430 mAh
Processor	?	200 MHz Motorola MX-1	1 GHz Qualcomm Snapdragon S4 MSM8270
RAM	?	?	512 MB
Storage	? raw hardware	? raw hardware	8 GB
Main Camera	-	1 megapixel	5 megapixel
Wide Camera	-	-	-
Tele Camera	-	-	-
Video Capture	-	?	720p HD
Front Camera	-	-	-
Weight	5.01 oz (142g)	?	4.39 oz (124g)
Dimensions	4.76" x 3.03" x 0.71" (121 x 77 x 18 mm)	3.46" x 2.34" x 1.1" (88 x 59 x 27.9 mm)	4.72" x 2.52" x 0.39" (120 x 64 x 9.9 mm)
Platform / OS	BlackBerry OS	Palm OS	Windows
Network Bands	CDMA: 850, 1900	CDMA: 850, 1900 AMPS: 850	WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900 *
Data Technology	1xRTT	1xRTT	HSPA+ 21
Features
Accessibility
Hearing Aid Compatible	-	-	Yes
TTY/TDD (Digital)	Yes	Yes	Yes
Alerts
Extra Display	-	Yes	-
Ringer Profiles	Yes	-	-
Connectivity
Bluetooth	-	-	Yes
Infrared (IR)	-	Yes	-
USB	Yes	-	Yes
Wi-Fi	-	-	Yes
Input
Side Keys	Yes	Yes	Yes
Text Keyboard, Hardware	Yes	-	-
Touch Screen	-	Yes	Yes
Memory
Memory Card Slot	-	Yes	Yes
Music
Headphone Jack (3.5mm)	-	-	Yes
Voice
Speaker Phone	-	-	Yes
	BlackBerry 7750	Samsung SPH-i550	Nokia Lumia 521 / 520
	X >	< X >	< X

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


Phone	BlackBerry 7750	Samsung SPH-i550	Nokia Lumia 521 / 520