My iPhone is almost out of storage, and I’m not sure what to delete or upgrade first. Photos, apps, and system data are taking up most of the space, so I need advice on the best way to free up iPhone storage without losing important files.
You can’t add more internal storage to an iPhone in any practical way. The storage chip is soldered onto the logic board, so those “upgrade your iPhone from 128 GB to 512 GB” videos are not something I’d treat as a normal repair option. It takes microsoldering tools, the phone has to be programmed correctly afterward, and one small mistake can kill the board. If there’s any warranty left, that’s gone too.
The realistic fix is to free up space and move stuff off the phone. That usually works better than people expect, especially if photos and videos have been piling up for years.
Clean out the big storage hogs first
Start with Settings > General > iPhone Storage. That screen gives you a decent idea of what’s actually eating the space, instead of guessing.
Photos and videos are usually the main problem. Apple Photos can help with exact duplicates, but it does not do a lot beyond that. If you want a more serious cleanup, Clever Cleaner is worth looking at because it’s actually free to use for removing files and doesn’t lock the cleanup behind a subscription.
Its Similars feature groups photos that look almost the same and suggests which one to keep, which is useful if you take a bunch of shots of the same thing. The Heavies section is also helpful because it surfaces your largest videos right away. Those are often the files taking multiple gigabytes without you realizing it. It can also find screenshots, turn Live Photos into still images if you don’t care about the motion part, and let you review photos one by one with a swipe-style interface.
After that, check apps. Delete anything you clearly don’t use. If you might need the app again later, use Offload App instead, since that removes the app itself but keeps its documents and settings.
Messages are another sneaky one. Old conversations can hold years of videos, photos, voice notes, GIFs, and random attachments. In iPhone Storage, you can review large message attachments and delete specific items without wiping the whole conversation.
Move older stuff off the phone
Once the obvious junk is gone, reduce what needs to live locally on the iPhone.
For photos, turn on Settings > Photos > Optimize iPhone Storage. Your phone keeps smaller local versions, while the full-resolution originals stay in iCloud. When you open something, the original downloads automatically.
Also check the Files app. PDFs, ZIP files, downloaded videos, and other random large files can sit there for months. If you use iCloud Drive, move those files there and choose Remove Download so the local copy is removed while the file stays available in the cloud.
The free 5 GB iCloud plan fills up fast, so if you don’t want to pay Apple for more storage, you can use Google Drive, Dropbox, or OneDrive for files you don’t need on the phone every day.
Use external storage for huge files
If you deal with large videos, RAW photos, or project files, an external drive may be the better answer. USB-C iPhones can connect to external SSDs and flash drives directly, and older Lightning iPhones have compatible storage accessories too.
If you’re moving large files often, an SSD is usually the better pick than a basic flash drive. It’s faster, tends to be more reliable, and comes in larger capacities, which matters if you’re working with video or big photo libraries.
Skip the hardware “upgrade” idea
Yes, replacing the NAND chip is technically possible in specialized repair labs. That does not make it a good option for normal users. You would be taking apart the phone, soldering a different storage chip onto the logic board, and then dealing with the required programming afterward.
For almost everyone, the better route is simple: clean up photos and videos, remove unused apps and attachments, move older files to cloud storage, and use an external drive when you need more room for big files. It’s safer, cheaper, and far less likely to turn the phone into a brick.
Don’t start deleting photos until you know they’re backed up somewhere outside the phone, because iCloud Photos can delete them everywhere if sync is on.
For a quick win, empty Recently Deleted after cleanup, then restart the phone and check storage again. “System Data” often shrinks only after the phone has breathing room, so freeing 5 to 10 GB first can matter more than chasing that category directly.
You probably won’t fix this permanently with one cleanup if the phone is a 64 GB or 128 GB model and you take a lot of video. You can buy time, but if storage is filling again every few weeks, that’s usually a sign your habits are bigger than the phone, not that you missed some magic setting.
A thing I’d check before deleting photos is app downloads and caches. Spotify, Netflix, YouTube, Podcasts, Maps, WhatsApp, Telegram, Instagram, and TikTok can quietly hold a ton of local data. Some of them have their own “downloads” or “storage” settings inside the app, and iPhone Storage doesn’t always make it obvious what is removable. For apps like Instagram or TikTok, deleting and reinstalling the app can clear cache, but don’t do that for anything where you might lose local drafts, saved projects, or chat data.
I agree with the warning above about iCloud Photos. “Optimize iPhone Storage” helps, but it is not the same as an extra hard drive. It still needs some local space to work, and if your iCloud is full, syncing can get weird. My order would be: remove offline videos/music/podcasts first, clear big message attachments, offload unused apps, then deal with photos after confirming they’re safely backed up somewhere. That usually frees space faster than staring at “System Data” and trying to guess what Apple means by it.
