How to Turn off the Screen Rotation Lock on the iPhone

Press the 'Home' button twice. The multitasking status bar opens at the bottom of the screen.
Flick the multitasking status bar to the right reveal the iPhone's iPod controls and the rotation lock. The rotation lock icon is located to the left of the iPod controls. A small lock symbol appears on the icon when the rotation is locked.
Tap the rotation lock on. A brief 'Unlocked' message appears. The small lock symbol does not show on the rotation lock icon.
Press the 'Home' button to close the multitasking status bar and return to your Home screen.
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