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iPhone 4S - Technical Specifications - Apple Support
iPhone 4s - Wikipedia
Apple iPhone 4s - Full phone specifications - GSMArena.com
Apple iPhone 4S (4s*) 8, 16, 32, 64 GB Specs - EveryMac.com
APPLE IPHONE 4S A1387 full specifications - Mobosdata
Identify your iPhone model - Apple Support
Apple iPhone 4S Specs - Techable
How to Tell an iPhone 4 from a 4s: Differences Explained - wikiHow
iPhone 4s Repair Help: Learn How to Fix It Yourself.
Apple iPhone 4S A1387 8GB (Apple iPhone 4,1) | Device Specs