iPhone 5: different models

The iPhone 5 comes in three different models. Confusing, eh? 4G LTE bands are so dispersed that a world phone is no longer possible when it comes to fast 4G data connections. So, Apple has 3 models of the iPhone 5 to help cover its bases. But which model is the right choice for you? Here are a few articles to disambiguate the situation:

Wired: Why Apple Made Three iPhone 5 Models and What That Means For You

Engadget: Apple details LTE plans for iPhone 5: true global reach requires multiple models

Mashable: iPhone 5: All the New Stuff

And from Apple: iPhone 5 models, LTE bands, and countries they are deployed in.