iTunes has been replaced by Apple Music, Apple TV, Apple Books, and Apple Podcasts on iOS and MacOS devices. Prior iTunes media library content can now be found in these new apps. Instructions on how to manage Apple Music and other subscriptions are available.
Apple released a statement that some iPhone 6 smartphones cannot be turned on due to a failed internal component. iPhone 6s and iPhone 6s Plus users can see if their phone may be affected by entering the phone serial number at this link.
Apple iPhone 5 users will also have to do an iOS update or they may experience issues in several major iPhone apps starting on November 3rd 2019.