How do I lock rotation with iOS 4 / iOS 5?

The iOS 4 firmware update includes a rotation lock feature, similar to the rotation lock switch found on the first generation iPad.iPhone 4 ships with iOS 4 and also has this capability. To enable rotation lock and prevent the screen from automatically changing orientation when the iPhone is turned:1. Double click the home button to bring up the multitasking bar.2. Swipe right until the last set of icons is displayed in the multitasking bar these will include play/pause and skip buttons for iPod or Pandora.3. The furthest left icon looks like a circular arrow – touch this icon to enable or disable rotation lock on the iPhone.4. A rotation lock icon will appear in the status bar next to the battery charge icon when rotation lock is enabled. This looks like a circular arrow around a padlock.