Apple released iOS 4.2.1 for the iPad and true to their word converted the iPad switch from screen orientation lock to mute and un-mute. If you’ve had an iPad since it launched you’ll understand how convenient that switch can be when using your iPad. Of course, this change brings the iPad into alignment with the iPhone. The iPhone switch has always been used to mute and un-mute that device.
Both devices now use the switch in the same way and the screen orientation lock has been moved to the running tasks bar which is accessible by double-tapping the Home button and swiping to the left..