While 'iPhone' often sounds like one, iconic thing, Apple has fielded many different models, and an incredible array of variants over the years. This year there's the state-of-the-art iPhone 5s, the pop-art iPhone 5c, and the held-over iPhone 4s. Sure, 5 sounds higher than 4, but what's the real difference between all these models? Does more money really get you more features, does saving up-front cost you in the long run, and how much phone do you really need? If you're looking to get your first iPhone, or looking to get one for family or friends, figuring it all out can be confusing. Here's what you need to know!