How to Free Up Storage on an Old iPhone When It's Full

Step 1: Find Out What's Using Your Space

Before deleting anything, get a clear picture of where your storage is going.

Go to Settings → General → iPhone Storage. You'll see a colour-coded bar showing how space is distributed across categories (Photos, Apps, iOS, Media, Other), followed by a list of every app sorted by size.

The 'Other' category deserves attention — it includes system caches, browser data, streaming app caches, and miscellaneous files that iOS accumulates over time. On an older iPhone, 'Other' can grow to 5GB or more. It can't be directly deleted, but several of the steps below will reduce it significantly.

Take note of the three or four largest items on your list before continuing — targeting these first gives you the biggest return for the least effort.

Step 2: Photos and Videos (Usually the Biggest Win)

Photos and videos are typically the largest storage category on most iPhones. Options:

Option A — iCloud Photos (recommended): Settings → Photos → toggle on iCloud Photos → select 'Optimise iPhone Storage'. This uploads your full-resolution library to iCloud and keeps smaller previews on your device. You retain access to every photo; they're just stored in the cloud rather than locally. Requires sufficient iCloud storage (free tier is 5GB; 50GB costs £0.79/month in the UK).

Option B — Export and delete: Connect your iPhone to a Mac or PC and copy photos to your computer using Finder (Mac) or Windows Explorer. Once backed up, delete the originals from your phone. Free and doesn't require iCloud, but needs a computer and takes longer.

Option C — Delete duplicates and screenshots: Screenshots accumulate silently and are rarely needed after the first week. Open Photos → Albums → Screenshots and delete everything older than a month. Most phones have hundreds of forgotten screenshots taking up gigabytes.

Step 3: Offload Apps You Don't Regularly Use

iOS has a built-in feature specifically for this: Settings → General → iPhone Storage → Enable Offload Unused Apps.

Offloading removes the app binary (the bit that takes up space) while keeping your data and the app icon on your home screen. If you tap the icon later, iOS re-downloads the app and your data is intact. This is different from deleting — deleting removes the data too.

For manual offloads, scroll down the app list in iPhone Storage (sorted by size) and look for large apps you haven't opened recently. Tap the app → 'Offload App'. Games are particularly good candidates — a game you haven't played in 6 months might be taking 2–4GB that you can recover instantly.

Manual offloads can easily free 3–8GB on a device that's been in use for several years.

Step 4: Clear Message Attachments

iMessage and WhatsApp silently accumulate photos, videos, voice notes, and GIFs from years of conversations. On older iPhones, this cache can grow to several gigabytes without the owner noticing.

For iMessage: Settings → General → iPhone Storage → Messages → Review Large Attachments. This shows all the largest files sent and received via iMessage. You can delete individual items or select all from a specific conversation.

Alternatively, you can set messages to auto-delete after 30 days or 1 year: Settings → Messages → Keep Messages → 30 Days or 1 Year. Note this deletes old conversations entirely, not just attachments.

For WhatsApp: WhatsApp → Settings → Storage and Data → Manage Storage. This shows the largest files and conversations by storage use. Clearing it regularly is one of the most effective storage habits for heavy WhatsApp users.

Step 5: Clear Browser and App Caches

Safari cache: Settings → Safari → Clear History and Website Data. This removes browsing history, cookies, and cached site data. It won't delete saved passwords, and it signs you out of websites — but on an older iPhone it can recover 200MB–1GB of 'Other' storage.

Streaming app caches: Spotify, Netflix, BBC iPlayer, and similar apps download content for offline playback that accumulates over time. Check each app's internal settings for a 'Downloads' or 'Storage' section and clear offline content you no longer need. Spotify in particular can accumulate several gigabytes of cached music that most users don't realise is stored locally.

A quicker cache-clearing trick: Deleting and reinstalling a large app (like Spotify or Instagram) removes not just its cache but often accumulated log files and temporary data the app never cleans up itself. Download size is a one-time cost; the recovered cache space is permanent until it rebuilds.

Step 6: If You're Still Stuck — iCloud Drive and Email

Two often-overlooked storage categories:

iCloud Drive on device: If you use iCloud Drive, any files you've marked as 'Keep on This iPhone' are stored locally. Files app → Browse → check for large files in iCloud Drive that could be removed from local storage without being deleted (tap and hold → Remove Download).

Email attachments: If you use the Mail app with a long-running email account, attachments from years of emails are cached locally. Settings → General → iPhone Storage → Mail → 'Edit' then delete mail caches, or go into Mail and delete large email threads with heavy attachments.

The nuclear option — restore and set up as new: If the above steps don't recover enough space and 'Other' is very large (10GB+), a full restore through Finder or iTunes (set up as new, not from backup) eliminates accumulated system cruft entirely. You'll need to set up apps again, but the result is a clean device with maximum available storage. Only recommended if you have a complete backup and aren't against the setup time.

Also see: Complete guide to keeping your older iPhone or iPad useful · iPhone 7 in 2026: what still works · How to install older app versions on older iOS