You need to be especially careful if you have older-generation iPhones with 32GB or 64GB of internal storage. Depending on which iPhone you have, the iOS 16 update may take up to 5GB of internal storage. How to prepare your iPhone for iOS 16: Free up storage Make sure that you free up at least 8GB of storage on your iPhone before going ahead with the iOS 16 upgrade. Back-up tip: Archive your backup Apple also recommends iPhone users to archive their backup, so that it is not overwritten by other backups. Remember, you need to have W-Fi 'On' to take iCloud back-up. However, in case this backup feature is disabled, you can go to Settings > Your Name > iCloud > iCloud Backup and then hit Back Up Now to back up your device. By default, your iPhone should back itself up every time it's connected to power and Wi-Fi. Your data must stay protected just in case something goes wrong. Though the chances of you losing your data are very less, but not entirely negligible. How to prepare your iPhone for iOS 16 download: Backup your iPhone It is highly recommended to take a backup of your iPhone before you download the new OS.
It is difficult to revert back to the previous version of the operating system (iOS 15 in this case), but it is possible. Can you revert back to iOS15 if there are issues Yes you can.
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