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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Apple Releases iOS 10.3.1 to Address Wi-Fi Vulnerability
iOS 10.3.1 is available as a free over-the-air update for all iOS 10 users, and it can also be downloaded via iTunes.
According to Apple's release notes, iOS 10.3.1 includes bug fixes and improves the security of your iPhone or iPad, and a security document suggests it fixes a Wi-Fi-related vulnerability. The release notes do not go into more detail about what bug fixes might be bundled into this release, so we'll update this post if and when we learn more about the content of the iOS 10.3.1 update.