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 ...
Check if the Portrait Orientation Lock is on; it stops the iPhone screen from rotating. Open Control Center and tap the lock icon to turn off rotation lock if it's active. Some apps don't rotate; test ...
This article explains how to enable and disable screen locking on devices running iOS 4 and up. It's broken down by iOS version and covers the ways to tell if screen locking is enabled. What if you ...