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iPhone 4 - Wikipedia
iPhone 4 - Technical Specifications - Apple Support
Apple Presents iPhone 4 - Apple
Apple iPhone 4 - Full phone specifications - GSMArena.com
iPhone 4 Phones for Sale | Shop New & Used Cell Phones | eBay
History of iPhone 4: Changing everything — again | iMore
Apple iPhone 4 (GSM) 16, 32 GB Specs - EveryMac.com
Apple iPhone 4 review: Apple iPhone 4 - CNET
iPhone 4: Everything You Need to Know | Digital Trends
iPhone 4 review | TechRadar