Model numberApple doesn't make it easy to identify your iPhone 3G S, as they're all labeled just "iPhone." However, the 3G is model A1241, while the 3G S is model A1303.
Images by iFixit, used by permission
Mark W. Kaelin has been writing and editing stories about the IT industry, gadgets, finance, accounting, and tech-life for more than 25 years. Most recently, he has been a regular contributor to BreakingModern.com, aNewDomain.net, and TechRepublic.