Phone Storage Full? How to Free Up Space on iPhone and Android

“Cannot take photo.” You see it at a birthday, or halfway through a concert, and suddenly phone storage full stops being a background nag. Updates fail too, and apps start to lag. Deleting a handful of photos rarely fixes it for long, because photos often aren’t what’s filling the phone.

A lot of popular phones still start at 128GB. According to WebProNews, a Tom’s Guide reviewer using the 128GB Pixel 10 Pro hit 95% capacity and struggled to free space without deleting apps or offloading media. Android Authority’s review of the Motorola Edge (2026) noted it starts at 128GB, down from 256GB on the previous model, with no microSD slot. Meanwhile photos and videos get bigger, apps grow, and messaging apps quietly keep every video anyone sends you.

It’s not only about space, either. Once less than about 10% is free, phones slow down, apps crash more often and system updates won’t install.

First, see what’s actually using the space

On an iPhone, open Settings › General › iPhone Storage and wait for the bar to load. It breaks storage into Apps, Photos, Media, Messages, iOS and System Data, lists apps by size, and offers suggestions such as reviewing large attachments.

On a Samsung, go to Settings › Device care › Storage (Battery and device care on older One UI versions). On a Pixel and most other Android phones, it’s Settings › Storage. The Files by Google app is also worth opening: tap Clean and it suggests junk files, duplicates, large files, old screenshots and downloaded media.

Go after the biggest category first. Clearing one large app or one video folder often frees more than an hour of deleting photos one by one.

WhatsApp is often the biggest culprit

On phones in Africa, the Middle East and Brazil, where big group chats share videos all day, WhatsApp is frequently the single largest user of space. Clean it from inside the app:

1. Open WhatsApp › Settings › Storage and data › Manage storage.
2. Go through Larger than 5 MB e Forwarded many times and delete in bulk.
3. Open the biggest chats on the list and clear old media.
4. Stop automatic downloads in Settings › Storage and data › Media auto-download.
5. On Android, turn off Media visibility so WhatsApp files don’t also appear in your gallery. Disappearing messages help in busy groups.

Clearing space on an iPhone

1. Offload apps you don’t use. In Settings › General › iPhone Storage, tap an app and choose Offload App. The app goes, its documents and data stay, and reinstalling brings it all back. To have iOS do this for you, turn on Offload Unused Apps in Settings › Apps › App Store (Settings › App Store on older iOS versions).
2. Clear big Messages attachments. In iPhone Storage, tap Messages, then Top Conversations or Photos/Videos, and delete what you don’t need.
3. Let old messages expire. Settings › Apps › Messages › Keep Messages › 1 Year or 30 Days.
4. Turn on Optimize iPhone Storage. In Settings › [your name] › iCloud › Photos, choose Optimize iPhone Storage so full-size originals live in iCloud. You’ll need enough iCloud space.
5. Empty Recently Deleted. Deleted photos sit in Photos › Recently Deleted for 30 days, still taking up space.
6. Remove downloads in Netflix, Spotify, Podcasts, Apple Music and Apple TV.
7. Clear Safari data if it’s large: Settings › Apps › Safari › Clear History and Website Data.

What is “System Data”, and why is it so big?

System Data (once called “Other”) is caches, logs, Siri voices, fonts and temporary files. It grows and shrinks by itself, and it can balloon after an update or a lot of streaming.

Restart the iPhone and give it a day; iOS clears many temporary files on its own. Clear Safari data, and offload or reinstall apps with big caches, which usually means streaming, social and messaging apps. Make sure you’re on the latest iOS, because storage bugs sometimes get fixed in point updates. If it’s still huge, back up, erase and restore. That usually knocks System Data right down.

Clearing space on Android

• Files by Google › Clean. Accept the safe suggestions: junk files, duplicates and old downloads.
• Clear app cache. Settings › Apps › [app] › Storage › Clear cache. Browsers, social media and streaming apps often hold gigabytes. Avoid “Clear data” unless you’re happy to sign in and set the app up again.
• Uninstall apps you don’t use. Sort by size in Settings › Apps. Pixels can also archive an app, which removes it but keeps your data.
• Look in Downloads. Old PDFs, APKs and videos pile up there unnoticed.
• Google Photos “Free up space”. Once photos are backed up, open Google Photos › profile › Free up space to delete the device copies.
• Empty the trash in Gallery, Google Photos and My Files. Deleted items can hang around for 30 days.
• Use a microSD card if your phone has a slot. Many recent ones don’t.

Settings says full, but you can’t find anything

The space is usually hiding in one of four places: system and app data (big caches and offline content inside apps), trash folders in Gallery, Photos and file managers, messaging media that WhatsApp and Telegram keep in their own folders, or a stuck update file left behind by a failed system update. Installing the update or restarting often clears that last one. Restart, empty every trash folder, then sort the app list by size again.

Photos and video without the bulk

Back up first, to iCloud Photos, Google Photos, Samsung’s cloud options or a computer. Then delete bursts, duplicates and screenshots: the iPhone Photos app has a Duplicates album, and Google Photos and Files by Google suggest blurry shots and screenshots.

Your camera settings matter as much as what you delete. 4K at 60 fps uses far more space than 1080p, so pick what you actually need in Settings › Camera › Record Video on iPhone or the video settings in your Android camera app. On iPhone, Settings › Camera › Formats › High Efficiency saves space compared with Most Compatible.

Keeping it from filling up again

• Turn on automatic cloud backup for photos so you can clear device copies regularly without worrying.
• Switch off auto-downloads in WhatsApp, Telegram and other messaging apps, especially on mobile data.
• Set messages to expire after a year, and use disappearing messages in busy groups.
• Stream music and video on Wi-Fi instead of downloading, and only keep offline downloads you’ll watch soon.
• Look at the storage screen once a month. Catching a fast-growing app early is far easier than rescuing a full phone.
• Next time you buy, go bigger than you think. If you shoot a lot of video and keep phones for years, 256GB is a safer bet than 128GB.

Still full? A reset, or a bigger phone

If System Data or system storage stays huge after all of that, back up and factory reset. It’s the reliable fix. Follow the backup guide first, then how to factory reset a phone properly.

If the phone is simply too small for the way you use it, the answer is more storage. Buying a used one? Check the storage size is what the listing says. An Apple model, color and storage check confirms it for iPhones, and a Samsung Info report does the same for Galaxy phones. The first All-in-one Basic Info check is free: