iPhone notification badges
How do the notification badges work on the latest iPhone? Google has made the Android badges totally useless on the new version of their OS.
An example. On my old 2019 Android phone if I had 3 unread text messages the number 3 would appear on my message icon, simple enough. If I went in and just read one message but left the other 2 unread the icon would change to a 2. On the latest Android OS it doesn't change to a 2, it removes the badge completely and I then have no reminder for the other 2 unread messages.
So, how does the iPhone work with these badges?