How to Free Up Space on iPhone Without Losing Your Photos

"Storage Almost Full" always arrives at the worst moment, usually with the camera already open. The standard answer to how to free up space on iPhone is to clear your cache, and it is close to useless. Safari website data on a phone in daily use is a few hundred megabytes, and most of it returns the next time you browse.

The advice that does work carries a risk nobody puts at the top of the article. Two of the fastest ways to reclaim several gigabytes will also delete photos from every device signed into your account, and there is a 30-day delay built into the process that makes it look like nothing happened at all. So people do it twice.

Here is the order I would work through, and what Apple actually charges for the alternative. That last part is my own arithmetic off Apple UK prices today.

Start with the real numbers, not the warning

Go to Settings, then General, then iPhone Storage, and give it thirty seconds to finish calculating - the first figure is usually wrong and settles once the scan completes. The list underneath ranks every app by how much it holds, and that list is the only thing worth acting on. Four things account for nearly all of it:

• Photos - almost always the largest single item, often by a factor of five
• Messages - not the text, the attachments, and they accumulate silently
• Apps' Documents & Data - podcast downloads, offline music, cached video, mapping data
• System Data - the category Apple will not itemise for you

Safari is not on that list, which tells you something about the advice ranking on page one for this question. Clear it if you like, but do not expect the number to move.

The 30-day trap that makes deleting photos look pointless

This is the single most common reason people conclude their iPhone is broken. You delete four hundred photos, go back to iPhone Storage, and the number has not changed. So you delete another four hundred.

Deleted photos are not gone. They move to Recently Deleted, and Apple keeps them there for 30 days before removing them permanently, which means they are still occupying exactly the same space on your phone. Apple states this plainly in its iCloud Photos documentation, but not on the storage page that ranks for this query.

To actually reclaim the space, open Photos, go to the Recently Deleted album, and empty it. On iOS that album is locked behind Face ID, which is why a lot of people never open it. Do that first, before you delete anything else, or you will spend an afternoon deleting things twice.

The iCloud Photos warning that belongs at the top

If iCloud Photos is switched on, your phone and the cloud are one library, not two copies. Apple puts it in one sentence: "When you delete photos and videos on one device, they'll be deleted everywhere that you use iCloud Photos." Your Mac, your iPad, icloud.com, all of it.

That is the trap. People turn on iCloud Backup, reasonably assume their photos are safe in the cloud, then start deleting from the phone to free up space. If iCloud Photos is on, they are not moving photos to the cloud, they are deleting them from it.

iCloud Backup and iCloud Photos are different things

iCloud Backup is a nightly snapshot that restores onto a new phone. iCloud Photos is a live sync of your library. If iCloud Photos is on, your photos are excluded from the backup, because they already sit in iCloud. Turning one off does not leave the other covering for it.

Before deleting a single photo, check Settings, your name, iCloud, Photos. If "Sync this iPhone" is on, anything you delete goes from everywhere. If you want the photos off the phone but kept, copy them to a Mac or a drive first, then delete.

Optimise iPhone Storage is the one free win

With iCloud Photos on, switch from "Download and Keep Originals" to "Optimise iPhone Storage". The originals stay in iCloud and your phone holds smaller versions, pulling one down only when you need it. On a library of any size this reclaims more than every other tip here combined, and it deletes nothing.

The catch is that it only works if you have enough iCloud storage for the full library. On the free 5GB tier it will do almost nothing, which is where the pricing question starts.

Messages: one setting, several gigabytes

Go to Settings, Apps, Messages, and find Keep Messages under Messages History. It offers 30 Days, 1 Year and Forever, and unless somebody has changed it, yours is on Forever. Every photo, video, voice note and meme anyone has sent you since you bought your first iPhone is still on this one.

Switching it to 1 Year is the highest-value tap in this entire article. On a phone that has been carried through two or three upgrades, the attachments alone routinely run to several gigabytes, and almost nobody scrolls back a year in a group chat.

It is genuinely destructive, though, so read this bit twice: messages removed this way are gone, not archived. If there is a conversation you want to keep, screenshot it or export it first. MacRumors has the settings path if you want a second pair of eyes on it before you commit.

There is a softer option in the same area. Review Large Attachments lists every big file anyone has ever sent you, sorted by size, and lets you delete them individually while keeping the conversation. Slower, but nothing disappears that you did not choose.

Offload apps rather than deleting them

In the iPhone Storage list, tapping an app gives you two buttons. Delete App removes the app and everything it holds. Offload App removes the app but keeps its documents and data, so reinstalling puts you back exactly where you were, provided the app is still on the App Store.

For anything you paid for, anything with a login you have forgotten, or anything holding work in progress, offload. For a game you finished in 2023, delete. The Offload Unused Apps toggle does this automatically and I leave it on, because the only cost is a short download later.

One caveat: offloading does not touch Documents & Data, which on podcast, streaming and mapping apps is usually the actual problem. If Spotify shows 12GB, the app itself is maybe 200MB of that. Open it and clear the downloads from inside.

What storage actually costs: my own arithmetic

At some point the honest answer is that the phone is too small, and the question becomes whether to pay Apple for space on the device or space in the cloud. Nobody on page one puts numbers on that, so here are mine, taken from Apple UK today.

The iPhone 18 Pro ladder runs £1,199 for 256GB, £1,399 for 512GB, £1,799 for 1TB and £2,399 for 2TB. So Apple charges £200 for the first 256GB step, £400 for the next 512GB, and £600 for the final 1TB. On the iPhone 17 the same 256GB-to-512GB step is also £200, taking it from £799 to £999.

Work that out per gigabyte and the first two steps are identical: £200 divided by 256GB, and £400 divided by 512GB, both land at 78p per gigabyte. The 2TB step is the only one that gets cheaper, at 59p. That is a one-off payment, and it is locked to that handset forever.

iCloud+ in the UK is 99p a month for 50GB, £2.99 for 200GB and £8.99 for 2TB. Now compare like with like. The £200 you would spend on 256GB of on-device storage buys 66.9 months of the 200GB plan - five years and seven months. The £600 you would spend on the 1TB step buys 66.7 months of the 2TB plan. Five years and six months.

Those two figures landing within a month of each other is a coincidence, but a telling one. Apple has priced on-device storage at roughly five and a half years of the equivalent cloud tier, right across the range. Keep a phone three years and the cloud is cheaper, and it moves with you. Keep it six and buy the storage.

The free tier deserves a mention of its own. Apple gives you 5GB, and the cheapest iPhone 18 Pro holds 256GB - so the free allowance covers 1.95% of the phone it is meant to back up. It has been 5GB since 2011. If you want the full picture on the paid tiers, I went through them in iCloud storage prices in the UK.

How to free up space on iPhone: the order I would do it in

• Empty Recently Deleted in Photos first, so everything else you delete registers immediately
• Switch iCloud Photos to Optimise iPhone Storage, assuming you have the cloud space
• Set Keep Messages to 1 Year, or work through Review Large Attachments if that feels too blunt
• Open your three biggest apps and clear their downloads from inside the app
• Turn on Offload Unused Apps and forget about it
• Only then decide whether you are actually paying for more space

If you are doing this because a new phone is arriving, the question changes shape, and a few things do not carry across at all - I covered that in how to transfer data from iPhone to iPhone. The Mac version is a different beast, because the mystery category there is not Photos - clearing System Data on a Mac is mostly snapshots.

Common questions about iPhone storage

Why is my iPhone storage still full after deleting photos?

Because deleted photos sit in the Recently Deleted album for 30 days before they are removed for good, and they take up the same space the whole time. Open Photos, go to Recently Deleted, and empty it. The space appears within a minute or two.

Will deleting photos from my iPhone delete them from iCloud?

Yes, if iCloud Photos is switched on. Apple syncs one library rather than keeping two copies, so a deletion on the phone removes the photo from every device and from icloud.com. Copy anything you want to keep to a Mac or an external drive before you start.

Is it better to buy more iPhone storage or more iCloud storage?

By my arithmetic on Apple UK prices, a storage step on the phone costs about five and a half years of the matching iCloud+ tier. Under three years with the handset, the cloud wins and follows you to your next phone. Beyond five, buy the bigger phone.

My take

Almost everything written about how to free up space on iPhone is a list of taps with no sense of scale, which is why people follow it, reclaim 400MB and give up. Two settings do nearly all the work: Optimise iPhone Storage and Keep Messages. The rest is rounding.

The part that bothers me is the sequencing. The genuinely destructive actions - emptying Recently Deleted, dropping Messages to a year, deleting from a synced photo library - are presented in the same flat tone as clearing a browser cache, when one of them can cost you a decade of photographs. Do the reversible things first and the irreversible ones deliberately.

And if you are doing this every month, the phone is too small. Work out how long you plan to keep it, compare that against five and a half years, and pay for whichever side of the line you land on.

Source: Keep your photos and videos in iCloud Photos, Apple Support. UK prices from apple.com/uk, checked 11 September 2026.