On Jan. 9, 2007, Apple introduced the world to the iPhone. With its all-touch interface and sleek design, the iPhone took a very different approach to the smartphone, which had been defined by front-runners like BlackBerry.

Ten years later, the iPhone is perhaps the most important device launched this century. It made smartphones a must-own device, and helped to transform how we live. Practically everything we do is through a smartphone, and the iPhone is a big reason for this shift.

So how did we get here? Here's a look at the 10 most important moments in the iPhone's history.