Camera uses subtle signals to let you know that your photo will be captured in landscape or portrait. Certain text and icons rotate to the position that Camera registers the photo will be captured as.

The easiest way to rotate your iPhone or iPad screen is by physically tilting the device. As long as the Orientation Lock toggle isn't turned on, you can easily switch between Portrait and Landscape ...

Waiting for others to kick the tires on Apple's newest iPhone system? In the meantime, make sure you've set up these features and options.