How can I ensure my iPhone has enough storage space for an update to prevent error 1109?

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Grade: Education Subject: Support
How can I ensure my iPhone has enough storage space for an update to prevent error 1109?
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Check your iPhone's storage by going to Settings > General > iPhone Storage. If it's low, delete unused apps, photos, or videos, or offload data to iCloud or a computer to free up space before attempting the update.