Why do you need the "update" of your phone? Why don't you want to update? (1x2 pages)
Updates are used to add features or fix faults
If you need to update your application, you can confirm it by appearing the Update button in App Store, etc.
In iOS15.1, you can use FaceTime to share new features such as animation and music with others.
"Android12" adopts the design idea of "Material You", the interface takes on a new look, and has a structure that can customize buttons and wallpaper in a uniform tone.
In fact, many people do not want to update the operating system.
AppleはiOSやiPad OSなどに対して、メジャーアップデートをしない人にもセキュリティアップデートを提供。筆者のiPadOSも「iPadOS 15」ではなく「iPadOS 14.8.1」にアップデートしているOSアップデートできない理由