The “Storage Almost Full” warning tends to appear at the worst possible moment, usually when you are trying to take a photo or install an update. Before you delete apps at random or pay for a bigger phone, it is worth knowing where your space actually goes. In most cases, a handful of targeted changes can free up several gigabytes in under half an hour. The good news is that it is usually easy to free up storage without losing anything important.
This guide covers both iPhone and Android, starting with the steps that recover the most space for the least effort.
Step 1: Find Out What Is Using Your Storage
Guessing wastes time. Both systems show a breakdown of what is filling your phone:
- iPhone: open Settings, then General, then iPhone Storage. You will see a coloured bar and a list of apps sorted by size.
- Android: open Settings, then Storage (on some phones this sits under Battery and device care or Device care). Menu names vary slightly between Samsung, Google Pixel, Xiaomi and other brands.
Give the screen a moment to finish calculating. The usual culprits are photos and videos, messaging apps, streaming apps with downloaded content, and a category called “System Data” or “Other”.
Step 2: Deal With Photos and Videos
For most people, the camera roll is the single biggest use of storage. Video is especially heavy: a minute of 4K video can take up several hundred megabytes.
On iPhone
- Turn on Optimise iPhone Storage in Settings, Photos. Full-resolution originals are kept in iCloud, while smaller versions stay on the phone. This requires enough iCloud storage for your library.
- Open the Photos app and check the Duplicates collection under Utilities, which lets you merge identical shots.
- Empty the Recently Deleted album. Deleted photos stay there for up to 30 days and still use space.
On Android
- In Google Photos, tap your profile picture and use Free up space. This removes copies from your phone that are already safely backed up.
- Check the Bin or Trash folder in your gallery app and empty it.
- Look through your Downloads folder for screenshots, memes and files you no longer need.
Before deleting anything, double-check that your backup has finished. A photo that exists only on your phone is gone for good once deleted.
Step 3: Clean Up Messaging Apps
WhatsApp, Messages and other chat apps quietly store every photo, video and voice note you receive. Group chats are often the worst offenders.
- WhatsApp: go to Settings, Storage and data, Manage storage. You can sort chats by size and review large files or forwarded media in bulk.
- iPhone Messages: in the Messages settings, change Keep Messages from Forever to one year. You can also review large attachments from the iPhone Storage screen.
- Turn off auto-download for media in group chats so new files are only saved when you choose.
Step 4: Remove or Offload Apps You Do Not Use
Most phones carry apps that have not been opened in months. Removing them is quick and easy.
- iPhone: turn on Offload Unused Apps from the iPhone Storage screen. The app is removed, but its documents and settings stay, so reinstalling it puts everything back.
- Android: the Play Store can archive apps you rarely use, which works in a similar way. You can also uninstall apps directly from Settings, Apps.
Step 5: Clear Downloads in Streaming Apps
Netflix, Spotify, YouTube, podcast apps and offline maps can store gigabytes of content. Open each app’s settings and delete downloaded episodes, playlists or map areas you have already used. Many apps also offer a “smart downloads” setting that removes episodes after you finish watching.
Step 6: Clear App Cache (Android)
Apps store temporary files called cache to load faster. Over time this can grow large, particularly in browsers and social media apps. On Android, open Settings, Apps, choose the app, tap Storage and select Clear cache. This does not delete your account or settings. Avoid Clear data unless you are happy to sign in again and lose local settings.
The free Files by Google app also has a Clean tab that suggests junk files, duplicates and large items to remove.
iPhone does not offer a simple clear-cache button for most apps. Offloading and reinstalling a large app is the closest equivalent.
What About “System Data” or “Other”?
This category includes caches, logs, temporary files and parts of the operating system. It often grows and shrinks on its own. If it seems unusually large, restarting the phone and installing the latest software update frequently brings it back down. A full backup and restore is a last resort. Official help pages from Apple Support and Android Help list the exact menu names for each software version.
Quick Comparison: The Best Ways to Free Up Storage
| Action | Typical space saved | Effort |
|---|---|---|
| Optimising or backing up photos | Several gigabytes | Low |
| Cleaning WhatsApp and Messages media | Hundreds of MB to several GB | Medium |
| Deleting streaming downloads | Varies widely | Low |
| Offloading unused apps | Hundreds of MB | Low |
| Clearing app cache | Tens to hundreds of MB | Low |
How Much Free Space Should You Keep?
Phones need breathing room to install updates and run smoothly. As a practical rule, aim to keep at least 10 to 15 percent of your storage free. Major system updates can need several gigabytes of temporary space to install.
Frequently Asked Questions
Will clearing storage speed up my phone?
It can help if your phone was nearly full, because a lack of free space slows down updates and some background tasks. It will not make an old phone feel new. If you are also seeing unknown apps, pop-ups or sudden battery drain, check our guide to the signs your phone has been hacked.
Should I buy more cloud storage?
If your photo library is large and growing, a cloud plan is often cheaper and easier than constantly deleting. It also protects your photos if the phone is lost or broken.
Do memory cleaner apps work?
Most third-party “cleaner” or “booster” apps add little beyond what is built into Android and iPhone, and some show aggressive adverts. The built-in tools and Files by Google are usually enough.
The Bottom Line
Start with photos and messaging apps, because that is where most storage goes. Then remove unused apps and old downloads. Doing a five-minute tidy every couple of months is far easier than a big clean-up when the warning finally appears. A regular routine is the easiest way to free up storage before it becomes a problem.
