Storage requirements for iOS 26 update
What storage is required for IOS 26
[Re-Titled by Moderator]
Original Title: IOS update
iPhone SE, iOS 18
You will need at least 20GB free space during the update process on your iPhone, to be sure that the upgrade is installed successfully.
Also check this recent discussion, which can also be applied for iPhones.
How much storage does iPadOS 26 need? - Apple Community