The release of a new version of iOS is exciting, with new features, new emojis, and bug fixes. However, that excitement can be spoiled if you don’t have enough space on your iPhone to upgrade. If you install the update wirelessly on your iPhone and you’ve used up most of your phone’s storage with things like movies and apps, you may get a warning that the update can’t be performed due to low space.
You’re not out of options. To upgrade to a new iOS version, follow a few tips on how to free up iPhone storage to make room for an update.
When you update your iPhone to the latest firmware version via Wi-Fi, the new software from Apple is downloaded to your phone. This means that you need at least as much free space on your phone as the size of the update.
However, you will need more space than that, because the installation process needs to create temporary files and delete obsolete and unused files. If you don't have enough space, you won't be able to upgrade.