As people lined up today to buy the brand new iPhone 4S, some people are wondering “Why?” Is it just for Siri, the “Personal Assistant” software (which Android users have had for ages with the “Genius Button”)? What is different about the iPhone 4S as compared to the iPhone 4 – after all, the number is the same. Is the iPhone 4S better than the iPhone 4? Should I upgrade to an iPhone 4S (or, if I don’t already have an iPhone, should I get an iPhone 4S?) Here’s what’s different, and what’s new.