iPhone storage full? Delete these first, in this order

"Storage Almost Full" tells you nothing about where to look. Most people respond by deleting a few apps they don't use, which barely moves the number, or by deleting a handful of photos, which moves it even less. The space is somewhere specific, and it's worth going there directly instead of guessing.

This is ordered by how much space each step actually gives back, not by how easy the step is.

1. Long and 4K videos

A nine-minute video of a car park at 4K can be two to three gigabytes on its own. This is usually the single biggest thing on the phone, and it's the thing people forget about because it's one file, not a pile of hundreds of photos.

1. 1Settings → General → iPhone Storage.
2. 2Wait for the list to load, then look at the size next to Photos — this includes videos.
3. 3In the Photos app, go to Media Types → Videos and scroll for long thumbnails — video length is printed on each one.
4. 4Delete or compress anything you don't need at full quality.

Step three is the weak link, because Photos cannot sort by file size and length is only a rough proxy for it. If you want the actual order, an app that sorts your library largest file first turns this step from a scroll into about thirty seconds.

2. Downloaded video in streaming apps

Netflix, YouTube and podcast apps that let you download for offline viewing keep those files in their own storage, separate from Photos. Settings → General → iPhone Storage lists each app with its size — a few downloaded shows or a backlog of podcast episodes can easily be several gigabytes sitting unused.

3. Messages attachments

Years of photos and videos sent and received in Messages add up quietly, and they're stored separately from your camera roll.

1. 1Settings → General → iPhone Storage.
2. 2Tap Messages.
3. 3Tap Review Large Attachments.
4. 4Scroll the list, which is sorted largest first, and delete the ones you don't need. Deleting here removes them from the conversation too.

4. Photos and near-identical shots

Photos rarely wins on any single file, but the volume adds up: retakes, bursts, screenshots, six tries at the same shot. The Duplicates album only catches exact copies — everything else needs a manual look or a similar-photo scan.

If iCloud Photos is on, deleting a photo from your phone deletes it from iCloud too. That's usually what you want — it's the same library — but it means "delete" here really does mean delete everywhere, not just locally.

5. App caches

Settings → General → iPhone Storage lists every app by size, with a recommendation to Offload Unused Apps. Offloading an app removes the app itself but keeps its documents and data, so reinstalling later restores your place. It does not touch photos or Messages, and it won't help if the app you're worried about is one you use daily.

One thing all five steps share: none of it is final until Recently Deleted is empty. Deleted photos and videos sit there for about 30 days holding their full size, so a big cleanup pass doesn't return the space until you empty it, on the last screen of the deletion flow or from the album directly.

Where Slean fits

Steps 1 and 4 are the two that return the most, and they are both inside the photo library, which is the only thing Slean works on. It sorts the library largest file first — the thing Photos will not do — filters by size, type and date, and finds the near-identical shots the Duplicates album skips. Streaming downloads and Messages attachments in steps 2 and 3 stay in Settings, where the iPhone already handles them well.

The same triage works on Android, but the categories sit in different places and Google Photos adds a step of its own. Here is the Android order.