iPhone Storage Almost Full: what to do first
· by Davyd Hruts
The warning appears when free space drops to a few gigabytes. The quickest real fix is the largest videos in Photos: delete or compress the top twenty. Then empty Recently Deleted. Clearing Safari or offloading apps helps a little; System Data usually shrinks by itself after a restart and a day of free space.
Why the warning keeps coming back
iOS needs free room to work: for updates, for caches, for the photos you take next. When free space falls under a few gigabytes it warns, and because every new photo and message eats into the same margin, the warning returns a day after a small cleanup. What stops it is freeing space in the places that are actually large, once.
The order that frees the most
- Videos: Photos, Media Types, Videos. The largest clips are usually most of the space.
- Recently Deleted: everything you deleted in the last 30 days still takes space until you empty it.
- Duplicates and screenshots: Photos, Utilities, Duplicates; Media Types, Screenshots.
- Message attachments: Settings, General, iPhone Storage, Messages, Review Large Attachments.
- Apps you do not use: Offload App keeps their data.
What is System Data, and can I delete it?
System Data, formerly Other, is caches, logs, downloaded voices and temporary files. You cannot delete it directly. It often shrinks after a restart, and it shrinks further once the phone has had some free space for a day, because iOS clears caches when it can. If it stays above 20 GB for weeks, an iOS update or, as a last resort, a backup and restore resets it.
Questions
How much free space should an iPhone have?
Keep at least 5 to 10 GB free, more before an iOS update, which can need several gigabytes to install.
Will a storage cleaner app remove System Data?
No app can clear iOS system caches; Apple does not allow it. Apps that claim to are cleaning their own caches or only your photos.