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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WhatsApp to Share User Data With Facebook to Show Targeted Ads
Existing WhatsApp users can choose not to share their account information with Facebook. On the iPhone app, before you tap "Agree" to accept the updated terms, tap on "Read," scroll to the bottom, and toggle the control. Users that agree to the updated terms also have an additional 30 days to opt out by going to Settings > Account > Share My Account Info and toggling the appropriate control in the app.
WhatsApp is free on the App Store [Direct Link] for iPhone.