How do I free up space on my phone quickly?

The fastest ways to reclaim phone storage, in order of how much they typically free versus how long they take.

Difficulty: beginner
Time: 30 min
Read: 2 min

Short answer

Empty the Recently Deleted photo album first — deleted photos still occupy space for 30 days. Then clear messaging app media, offload or delete unused apps, and check for large videos. Photos and videos are almost always the largest category.

Storage panics get solved by deleting apps and photos people actually want, while gigabytes sit in recently-deleted albums and messaging app caches. Looking at the storage breakdown first shows where the space actually is.

What you'll need

Cloud storage account (optional)
Cable and computer (optional)

Step by step

Open the storage breakdown and look at what is actually using space.iPhone: Settings → General → iPhone Storage. Android: Settings → Storage. It is usually a surprise.
Empty the Recently Deleted photo album.Deleted photos are retained for 30 days and still occupy storage. This is the single fastest win and frees a lot.
Clear media stored by messaging apps.WhatsApp and similar apps save every image and video ever sent to you. This is frequently the largest single category after the camera roll.
Find and review large videos.Both platforms let you sort by size. A handful of long videos often free more than a thousand photos.
Offload apps you rarely use rather than deleting them.Offloading removes the app but keeps its data, so reinstalling restores everything. On Android, clearing an app's cache is the equivalent.
Delete downloaded offline content.Podcasts, streaming downloads, offline maps and games all cache large amounts silently.
Turn on optimised photo storage.iCloud Photos 'Optimise Storage' and Google Photos backup keep recent files local and older ones in the cloud.
Verify the cloud backup completed before deleting local photos.This is the step where people lose photos permanently. Check, then delete.

Tips

'Other' or 'System Data' is mostly caches. It often shrinks on its own after a restart and a day or two.
Storage cleaner apps mostly duplicate what the operating system already does, while adding adverts and permissions.
If you are constantly at capacity, the underlying issue is usually the photo library. Cloud storage solves storage and backup together.

Common mistakes

Deleting apps before checking the breakdown — Apps are usually a small fraction of the total. Photos, videos and messaging media dominate.
Forgetting the Recently Deleted album — Photos deleted there still occupy space for 30 days, so deleting more photos appears to free nothing.
Deleting photos before verifying the backup — The most common way people permanently lose photos.

Questions people ask

Why has deleting photos not freed any space?

They are in the Recently Deleted album, where they stay for 30 days and continue to occupy storage. Empty that album to actually reclaim the space.

What is 'System Data' or 'Other' storage?

Mostly caches, logs and temporary files. It usually shrinks by itself after a restart and a day. If it stays very large, offloading and reinstalling the biggest apps clears it.