[Oops. He should have slowed down. It's hard for him to gauge what she knows and what she doesn't, but this question is enough for him to do better with the explanation.]

Uh, you know what cameras are, right? There's a really small one in the phone, near the back part of it. You see that dark indention? That's where the lens is, and the rest of camera is built into the phone itself. All of the phone's parts are really compact.

If you want, I could take a picture and show you.