You spent an evening clearing photos. The app said you freed 6 GB. Your phone still says storage is almost full. Nobody lied to you, but four things can stand between deleting a photo and getting its space back. Here they are, in the order they usually matter.
1. It's waiting in Recently Deleted (or the trash)
On iPhone, deleted photos and videos go to the Recently Deleted album and stay there for 30 days, so you can change your mind. Until then they still take up space. Apple's own guide describes the 30-day window.
To get the space back now: open Photos, scroll down to Recently Deleted under Utilities, unlock it, tap Select, then Delete All. This can't be undone, so only do it when you're sure.
On Android, most gallery apps also keep deleted items in a trash for about 30 days (some differ), and Google Photos keeps backed-up items in its own trash for 60 days. Emptying the trash in your gallery app gives the space back. RoomForGems on Android can remove the items you deleted with it from the trash for good, with your phone's own confirmation.
2. It was only in iCloud in the first place
If iCloud Photos is on with Optimize iPhone Storage, many of your photos live in full only in iCloud, and the phone keeps a small preview. Deleting one of those frees iCloud space, not phone space. The bigger saving on the phone comes from photos and videos that are stored in full on the phone, which are usually the recent ones.
Apple's guide to managing iCloud storage explains how the two are counted separately. RoomForGems shows you which part of a delete is phone space and which part is only iCloud space, before you delete.
3. Something else grew at the same time
Apps, messages, downloads and the system itself keep growing. If a messaging app cached 2 GB of videos this week, it can quietly use the space you just freed. On iPhone, Settings › General › iPhone Storage lists apps by size. On Android, look in Settings › Storage.
RoomForGems keeps a short history of the phone's free space, so it can say "apps and system data grew by about 1.4 GB since your delete" as a measured fact rather than a guess.
4. System Data is big, and it's not yours to clear
"System Data" (once called "Other") holds caches, logs and temporary files. It grows and shrinks on its own, often after an update. No app, including ours, can clear it, and no honest app can say otherwise. Our guide to what System Data is explains what helps.
How to check, in two minutes
- Write down the free space in Settings before you delete anything.
- Delete, then empty Recently Deleted or the trash.
- Restart the phone (it lets the system finish tidying up) and check Settings again.
If the number went up by roughly what you deleted, the space came back. If it didn't, one of the four reasons above is almost always why. RoomForGems does these checks for you on every delete, with the phone's own numbers, under Where did the space go? It's free for up to 1 GB, then $9.99 once, with no subscription.