How to Lock Portrait Orientation on iPhone & iPad
By Sarah Kingsbury
It's super convenient to be able to rotate your screen from portrait to landscape mode automatically, as well as lock it later when you need to. Luckily, both the iPhone's and iPad's screen rotation lock button is easy to access via the Control Panel. With the orientation lock enabled, you can keep your screen from adjusting regardless of whether the device is rotated vertically or horizontally.