To add what Alan said, the smart phones will automatically rotate the image when the phone is upside down, with a regular camera, that's now happening. But with a regular camera the lens is already closer to the ground by the way the cameras are designed. So turning the camera upside down wouldn't give you what the difference is with a phone, where when it's turned upside down, the camera is now 3 to 4 inches lower to the ground.
I have seen some cool shots, maybe you have seen the same shorts where the put the phone upside down, sometimes using a mirror to reflect the image like it's in water, etc. Phones give a lot of creativity, and most of it could be replicated with a regular camera I think. The power that the phones have with their camera is the computational photography that they do. So they don't have to deal as much with DOF for one thing. And while the phones have Portrait modes that let you limit the DOF, they can also just not work with that as the computer in the phone has to decide what's in focus and what isn't. So that's where a traditional camera would excel.
