The short answer: Photos and videos are almost always the biggest culprit — but the second biggest, which most people miss, is app data that accumulates invisibly over time. Specifically: your messaging apps (iMessage, WhatsApp, Messenger) store every photo, video, and file ever sent in your conversations without ever deleting them automatically. On a phone you've used for a few years, this alone can take up 10 to 20 gigabytes. Here's how to find exactly what's using your storage and free it up without losing anything important.
Find Out Exactly What's Taking Up Your Space First
Before deleting anything, check what's actually there. Guessing leads to deleting the wrong things.
On iPhone: Settings → General → iPhone Storage. Wait about 30 seconds for it to fully analyze. A colored bar at the top shows your total storage broken down by category. Below it, every app is listed with exactly how much space it's using — sorted from largest to smallest.
On Android: Settings → Battery and device care (or Storage, depending on your phone model) → Storage. You'll see a similar breakdown by category.
Look at the list carefully. Note the top three apps using the most space. Those are where you'll make the biggest difference.
The Categories That Use the Most Space — and What to Do About Each
Photos and Videos — Usually the Biggest Category
Photos and videos are the single largest storage user on most phones. A single 4K video recorded on a modern iPhone or Android phone can be 300 to 500 megabytes. An hour of video is several gigabytes. If you've had your phone for two or three years and record video regularly, it's easy to accumulate 20 to 50 gigabytes of photos and videos.
The fix that keeps everything safe: Turn on cloud photo backup before you delete a single photo.
On iPhone: Settings → your name → iCloud → Photos → turn on "iCloud Photos." Your photos and videos will upload to iCloud and become available on all your Apple devices. Once they're backed up to the cloud, you can turn on "Optimize iPhone Storage" — this keeps a small preview of every photo on your phone but stores the full-resolution version in iCloud, freeing up significant space automatically.
On Android: Download Google Photos (it comes pre-installed on many Android phones) → tap your profile picture → Google Photos settings → Back up → turn on Backup. Google Photos gives you free storage for photos and videos backed up at "Storage Saver" quality. Once backed up, you can delete photos from your phone and still access them in Google Photos anytime.
After setting up backup: Wait for the backup to fully complete (you'll see a checkmark or "Backup complete" message). Then delete duplicate photos, blurry shots, and screenshots you don't need. For iPhone, also go to the Recently Deleted album and delete everything there — deleted photos stay in this album for 30 days before being permanently removed, still taking up space in the meantime.
Messages — The Hidden Storage Hog Most People Don't Check
Here's the one that surprises people the most: every photo, video, GIF, and file that has ever been sent or received in your text messages and messaging apps is stored on your phone forever, unless you manually delete it.
A conversation with a close friend or family member over several years can contain thousands of photos and videos — collectively taking up gigabytes of space. This data doesn't show up obviously in your storage breakdown; it's buried inside the messaging app's storage.
On iPhone — check iMessage storage: Settings → General → iPhone Storage → Messages. Apple will show you the breakdown within Messages: photos, videos, GIFs, and attachments each with their sizes. Tap each category and select "Review Large Attachments" — you can delete large files from your message history without deleting the text conversations themselves.
For a more thorough cleanup: in the Messages app, go to any conversation, tap the person's name at the top → the (i) information icon → scroll down to Photos/Videos/Files. You can select and delete specific media from conversations you want to keep.
WhatsApp: Open WhatsApp → Settings → Storage and data → Manage storage. WhatsApp shows you exactly which conversations are using the most space and lets you bulk-delete old media with a few taps — without deleting the conversations themselves.
Facebook Messenger, Instagram: In each app, go to Settings → Storage (or Account → Device Storage) and clear cached data.
Apps — Many Are Larger Than You Think
Some apps are surprisingly large. Games in particular can be several gigabytes each. Social media apps accumulate large caches over time.
On iPhone, go to Settings → General → iPhone Storage and scroll through the app list. Tap any app to see two numbers: the app size itself, and the "Documents & Data" — which is the accumulated cache and user data. For apps with a large Documents & Data figure (anything over 500 MB that you don't actively need), you can offload the app (which deletes the app but keeps your data) or delete it entirely.
On Android, go to Settings → Apps → select any app → Storage. You'll see the app size and cache size separately. Tapping "Clear Cache" removes only the temporary cached files without affecting your data in the app — this is safe to do for any app.
Games you haven't played in months: Delete them. If you want to play again later, you can reinstall — most games save your progress to the cloud or allow you to restore it by logging into your account.
System and "Other" Storage
On iPhones, a category called "Other" or "System Data" sometimes grows very large and seems impossible to reduce. This is typically made up of cached data from apps, downloaded content like offline maps and Spotify songs, and system files.
The most effective way to reduce it: Back up your iPhone to your computer using a cable (not iCloud — an actual iTunes/Finder backup). Then erase your iPhone and restore it from that backup. This process clears all accumulated system cache during the restore and reliably reduces the "Other" category significantly. It sounds drastic but the whole process takes about an hour and your phone comes back exactly as it was — just with a smaller "Other" category.
This isn't something you need to do every month, but once every year or two it's the most thorough cleanup available for the "Other" category specifically.
Quick Wins — Things That Take Under 5 Minutes
If you want to free up space right now without a lot of steps:
- Delete apps you haven't opened in 3 months. On iPhone, Settings → General → iPhone Storage shows "Last Used" dates for each app — apps with dates from months ago are candidates. On Android, Google Play → Manage apps → sort by last used.
- Clear your browser's downloaded files. In Chrome or Safari, go to your downloads history and delete files you no longer need — PDF receipts, documents, files you downloaded once and forgot about.
- Delete podcasts you've listened to. If you use a podcast app, episodes you've already listened to are stored on your phone. Open your podcast app and delete listened episodes.
- Delete offline music and videos. If you've downloaded songs from Spotify, albums from Apple Music, or videos from Netflix or YouTube for offline use — those are stored on your phone. If you have good internet access most of the time, you don't need to keep offline copies.
Pro Tip: Turn on Automatic Storage Management So This Never Gets This Bad Again
Both iPhone and Android have built-in tools to automatically manage storage — but they're turned off by default.
iPhone: Settings → General → iPhone Storage → scroll down and look for "Recommendations." iPhone will suggest specific actions, including automatically deleting iCloud-backed photos from your device, removing old Apple TV downloads, and turning on "Offload Unused Apps" — which automatically removes apps you haven't opened in a while while keeping your data.
Android: Settings → Battery and device care → Storage → scroll down to look for "Smart suggestions" or "Auto optimization." Enabling these lets Android automatically clear cached files and suggest app deletions when storage gets low.
Setting these up now means your phone manages its own storage in the background — and you won't find yourself at 98% full again without warning.
Last updated: July 2026. Storage settings and menu locations vary between iPhone and Android models and software versions. The categories and strategies described here apply broadly across all current smartphones.
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