Most users prefer updating their mobile devices wirelessly (over-the-air), but you can also use a computer if storage is limited or for troubleshooting. Update your iPhone, iPad, or iPod touch with the Finder
Keeping your Apple devices current ensures you have the latest security protections, bug fixes, and innovative features. Whether you are using an iPhone, iPad, or Mac, the process to is designed to be straightforward, though options vary between manual and automatic methods. How to Update iPhone and iPad apple download software update