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All Differences Between iPhone 3GS and iPhone 4: EveryiPhone.com
Compare Apple iPhone 4 vs. Apple iPhone 3GS - GSMArena.com
Every iPhone release in chronological order: 2007-2024
Apple iPhone 3GS vs Apple iPhone 4: What is the difference?
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iPhone 4 vs. iPhone 3GS: Worth the Upgrade? - Laptop Mag
iPhone SE 4 vs iPhone SE 3: Biggest changes we expect
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