When storage is nearly full, start with the phone's storage settings to see which categories take up the most space. Photos and videos, downloaded shows, large games, and message attachments are common contributors. Review files before deleting them, especially if they are important or have not been backed up elsewhere. Clearing space from the largest categories usually helps more than removing many tiny items.
Delete offline downloads you can access again, remove apps you no longer use, and check whether messaging apps keep large media files. Some phones offer a tool to offload unused apps or clear temporary files; read what it removes before confirming. If you use cloud photo storage, verify that uploads have finished and understand whether deleting a local copy also deletes it from the cloud library.
After freeing space, restart the phone and check storage again. Keep some capacity available for updates, camera use, and normal system operations, rather than waiting until the device cannot install anything. Set a reminder to review downloads and large attachments periodically. If storage fills unusually quickly, check recently installed apps and new media habits. When choosing your next phone, use this history to select a capacity that better suits your actual needs.