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How to Tell an iPhone 4 from a 4s: Differences Explained - wikiHow
Compare Apple iPhone 4 vs. Apple iPhone 4s - GSMArena.com
iPhone 4s - Wikipedia
iPhone 4 - Wikipedia
Are the iPhone 4 and iPhone 4S 4G Phones? - Lifewire
Apple iPhone 4s - Full phone specifications - GSMArena.com
iPhone 4S - Technical Specifications - Apple Support
All Differences Between the iPhone 4 and iPhone 4S: …
iPhone 4 vs. iPhone 4S (comparison chart) - CNET
iPhone 4 - Technical Specifications - Apple Support