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.
macOS Catalina Now Available
Apple Releases iOS 11.0.1 Update With Fix for Exchange Email Bug [Updated]
The iOS 11.0.1 update can be downloaded to all eligible devices over-the-air in the Settings app. To access the update, go to Settings --> General --> Software Update.
Today's update addresses several minor bugs that have been discovered following the release of the iOS 11 golden master. According to Apple's release notes the update includes bug fixes for iPhone and iPad.
iOS 11 is a major update to the iOS operating system with a redesigned Lock screen experience, a new customizable Control Center, a new Siri voice, a redesigned App Store, and an overhauled interface for the iPad. For more info on all the new features in iOS 11, check out our iOS 11 roundup.
Update: As noted by Ars Technica, iOS 11.0.1 appears to fix an Exchange e-mail server bug that prevented many users from sending email from Outlook, Office 365, and Exchange Server email accounts. In a support document covering the feature, Apple now says customers can fix the issue by updating to iOS 11.0.1.