How to make my iPhone updates automatically?
Can you Update the software always?
[Re-Titled by Moderator]
iPhone 6s Plus, iOS 13
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Your iPhone 6S can be updated to the latest version, which is 15.3.1. Go to Settings/General/Software Update. If it doesn’t offer 15.3.1 you may have a beta version of iOS 13, which you will have to remove. See→Restore Old iOS from Public Beta