https://techcrunch.com/2023/03/27/apple-releases-ios-16-4-with-new-emojis-web-push-notifications-voice-isolation-for-calls-more/

Apple today released the iOS 16.4 update to users, which includes a number of new features like an expanded set of emojis, voice isolation for calls, website push notifications, and more. Users can update to the latest version by going to Settings > General > Software Update.

While iOS updates often simply patch security holes or tweak smaller settings, those that deliver new emojis or expanded functionality are often more popular with consumers, leading to high demand for the download. That means you may have to wait a bit in order to install the latest update on your device.