Unfortunately, most of these new features do not function on older Apple devices like iPhone 4, due to limitations. Some apps even require at least iOS 7 to work ...
Apple Security Updates: Security researchers say the attack combines several vulnerabilities to target devices running iOS versions between iOS 13 and iOS 17.2.1.
From time to time, apps get updated, bringing interface tweaks, bug patches and new features. But updates occasionally make an app worse, and may no longer work on a particular model of iPad or iPhone ...