What does a padlock in a circle with an arrow right orientation at the top of my phone means?
I just happen to see a padlock in a circle at the top right side of the main screen?.
iPhone 4, iOS 5.1, where do I see my operating system?
Orientation Lock
Settings > General > Lock Rotation..
Double-press the home button...
Swipe to the right until you get to the Portrait Orientation Button...
Understanding the Side Switch