Night mode is an automatic setting which takes advantage of the new wide-angle camera that's in the iPhone 11 and 11 Pro models. It's equipped with a larger sensor that is able to let in more light, allowing for brighter photos when the light is low.
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iOS 4.3 Beta Brings Software Option for Rotation Lock or Mute on iPad
One of the more controversial changes made with the release of iOS 4.2 late last year was a change in the functionality of the switch on the side of the iPad, moving it from a screen rotation lock to a mute switch as seen on the iPhone. Apple CEO Steve Jobs had even reportedly responded to a customer question by noting that the change was permanent and that it would not be a user-configurable option.
Apple appears to have had a change of heart, as today's iOS 4.3 beta appears to have added an option in the device's Settings application to allow users to customize the behavior of the switch.