I have an iPhone 6 and have had the same photo of my daughter standing in front of a red phone booth in London as my wallpaper for the last 3 years. When I take the phone out of my pocket, there she is, in portrait mode, ready to go.
After I upgraded to iOS 11.4, whenever I take the phone out of my pocket, her photo is displayed (cut off and cropped) in landscape mode. Worse yet, it won't rotate until I click and get into the phone through the lock screen.
I want the wallpaper on the screen that comes up when I open the phone to always be portrait. Can anyone tell me how to fix this?