Use the system storage breakdown first, then inspect the few categories large enough to make a meaningful difference.
On iPhone
Open Settings, General and iPhone Storage. Allow the recommendations and app list to finish calculating. Review app size separately from Documents & Data; deleting the app may remove local data that offloading would preserve.
On Android
Open the device storage settings. Names differ by manufacturer, but the screen normally separates apps, images, video, audio, documents and system data. Google Files or the manufacturer’s file manager can help identify large and duplicate items.
Investigate large “other” data
- Offline downloads inside streaming apps.
- Message attachments.
- Browser downloads.
- Maps and translation packs.
- Editing-app project files.
- Work-profile or secure-folder data.
Do not delete system folders at random
A file manager may expose folders whose purpose is unclear. Use the app’s own storage controls or official support instructions rather than deleting unknown databases and configuration files.
Separate reclaimable space from irreplaceable data
The largest category is not automatically the safest one to delete. Identify who owns the data and whether it exists elsewhere.
- Open the largest apps and folders rather than trusting a single summary label.
- Verify cloud copies from another device before removing local originals.
- Leave enough free space for updates, camera processing and temporary files.
Official sources
Facts checked: 26 July 2026. Menu paths, service rules and device behaviour can change. Recheck the exact phone, software version, account and provider before acting.
