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‘Why won’t my iPhone update to iOS 13?’: How to troubleshoot iPhone updating issues in 4 ways

Ensure you have enough available storage

Make sure you have more than 2GB of storage space available.
Dave Johnson/Business Insider

If you have a compatible iPhone model, but it still won't update, you might not have enough free space.

You'll need more than 2GB of free storage. You can see how much storage is available by checking your Settings app.

To see how, as well as how to free up additional space, see our article, "How to free up space on an iPhone that's running out of storage."