What's Portrait Orientation Lock on iPhone?
S Portrait Orientation Lock on iPhone? - 1
Your iphone is locked on the portrait view.
It's just Auto-rotate option named differently.
It locks your phone to the portrait view, meaning you can't turn it to the side when tilting the phone 
As the name implies it looks your screen orientation to portrait mode. Meaning you wouldn't be able to rotate the display to landscape while that is on.
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