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iPhone 4 - Wikipedia
iPhone 4 - Technical Specifications - Apple Support
Apple iPhone 4 - Full phone specifications - GSMArena.com
Apple Presents iPhone 4 - Apple
History of iPhone 4: Changing everything — again | iMore
iPhone 4: Everything You Need to Know | Digital Trends
Apple iPhone 4 specs - PhoneArena
iPhone 4 review | TechRadar
Apple iPhone 4 Verizon specs - PhoneArena
iPhone 4 review - Engadget