Our best tips for using the iPhone Duo

The Duo is an entirely new kind of iPhone, so it comes with a bit of a learning curve. That's a wild thing to imagine, since the iPhone has had very few fundamental changes since its inception. But the Duo is built different. If you won the preorder lottery and managed to get your hands on one today, you'll see what that means. You'll laugh, you'll cry, you'll lose track of the volume buttons as you turn the thing around.

We've learned a few tricks over the past week of flipping and folding the Duo as much as we could. Here are our favorite tips and hacks for newly minted Duo owners.

You can set orientation lock on each screen independent …