Delete unused apps
Offload unused apps
Delete large photos and videos
Empty the Recently Deleted album
Remove downloaded music
Remove downloaded movies and TV shows
Clear Safari website data
Delete old messages and attachments
Review and delete large files in the Files app
Remove offline maps
Delete podcasts and downloads
Clear app caches if the app allows it
Back up photos and videos to iCloud or another service
Restart the iPhone after deleting files
Check iPhone Storage in Settings to find the largest items