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Phone	Nokia Lumia 521 / 520	Samsung SGH-i300	Apple iPhone 4 (GSM)
Current U.S. Carriers	(none)	(none)	(none)
Global Availability	Released	Released	Released
Display Size	4" diag. 5 : 3	?	3.5" diag. 5 : 3
Display Resolution & Type	480 x 800 pixels (~233 ppi) LCD (TFT/TFD)	240 x 320 pixels LCD (TFT/TFD)	640 x 960 pixels (~330 ppi) LCD (TFT/TFD)
Display Refresh	?	?	60 Hz
Battery	1,430 mAh	?	?
Processor	1 GHz Qualcomm Snapdragon S4 MSM8270	?	Apple A4
RAM	512 MB	?	?
Storage	8 GB	? raw hardware	32 GB *
Main Camera	5 megapixel	1 megapixel	5 megapixel
Wide Camera	-	-	-
Tele Camera	-	-	-
Video Capture	720p HD	?	720p HD
Front Camera	-	-	Yes
Weight	4.39 oz (124g)	4.59 oz (130g)	4.8 oz (136g)
Dimensions	4.72" x 2.52" x 0.39" (120 x 64 x 9.9 mm)	4.45" x 1.89" x 0.79" (113 x 48 x 20.1 mm)	4.5" x 2.31" x 0.37" (114 x 59 x 9.4 mm)
Platform / OS	Windows	Windows Mobile Standard	iOS
Network Bands	WCDMA: 2, 4, 5 GSM: 850, 900, 1800, 1900 *	GSM: 900, 1800, 1900	WCDMA: 1, 2, 5, 8 GSM: 850, 900, 1800, 1900
Data Technology	HSPA+ 21	GPRS	HSPA 7.2
Features
Accessibility
Hearing Aid Compatible	Yes	-	Yes
TTY/TDD (Digital)	Yes	-	Yes
Alerts
Ringer Profiles	-	Yes	-
Connectivity
Bluetooth	Yes	Yes Classic Audio	Yes Classic Audio
Infrared (IR)	-	Yes	-
USB	Yes	Yes	Yes
Wi-Fi	Yes	-	Yes 4 (802.11 b,g,n)
Input
Side Keys	Yes	Yes	Yes
Touch Screen	Yes	-	Yes
Memory
Memory Card Slot	Yes	Yes	-
Music
Headphone Jack (3.5mm)	Yes	-	Yes
Stereo Speakers	-	Yes	-
Photo & Video
TV Output	-	-	Yes
Voice
Speaker Phone	Yes	Yes	Yes
	Nokia Lumia 521 / 520	Samsung SGH-i300	Apple iPhone 4 (GSM)
	X >	< X >	< X

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


Phone	Nokia Lumia 521 / 520	Samsung SGH-i300	Apple iPhone 4 (GSM)