Open the storage breakdown and find which category occupies the space. Remove downloaded files or unused apps before deleting personal photos or messages. Confirm that anything important has a usable backup. Storage expansion and cloud options differ by model, so follow the matching notes below.
Differential
Likely causes of “Apple iPhone with Lightning storage is full”, and how to tell them apart
- 1
Years of photos and video
What separates it Photos is the largest item on the Storage screen
How to confirm Apple says photos and videos are stored in full resolution by default; use iCloud Photos with Optimize Storage
- 2
Apps and their data
What separates it One app holds several gigabytes of data and dominates the list on the Storage screen
How to confirm Delete or offload the app from the Storage screen
- 3
A 64 GB model
What separates it The phone fills up again within a few weeks of a cleanup, so something keeps growing
How to confirm Apple lists 64 GB as the smallest capacity for every phone in this family
- 4
Downloaded music and video
What separates it Offline downloaded media takes up several gigabytes of space in the Storage list
How to confirm Delete the games, films and albums you no longer play or watch and check the free space figure
- 5
No room for the last update
What separates it Software Update fails or says it needs more space before it can download the new version
How to confirm Free up space first, then run the update again so it has room to download and install
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which of the four phones you have and its capacity
- The largest categories under iPhone Storage
- Whether iCloud Photos is on and how much iCloud space remains
Try in this order
0 of 7 completedCheck your storage
ReversibleOpen Settings, General, iPhone Storage and wait for it to load. Note the largest categories and any recommendations Apple lists before deleting.
Turn on iCloud Photos
ReversibleOpen Settings, your name, iCloud, Photos, then turn on Sync this iPhone and choose Optimize iPhone Storage so full-size photos live in iCloud.
Check iCloud space
ReversibleOpen Settings, your name, iCloud to see how much cloud storage is left; the same screen lets you upgrade a plan if backups need more room.
Delete big apps and media
ReversibleRemove apps and downloaded video you no longer use, starting with the largest entries in the Storage list to free the most space quickly.
Follow the recommendations
ReversibleThe Storage screen may suggest actions such as offloading apps; review each suggestion before accepting so you do not lose anything you want to keep.
Restart
ReversibleA restart clears temporary files that the Storage screen may still count as used, so recheck the free space figure once the phone has restarted.
Install the last update
ReversibleApply the latest iOS your phone supports once there is room, since the update often carries fixes for the fault you are seeing.
Model-specific
What is true of this model and not of its siblings
- Apple iPhone XS family storage is full or the device cannot install updates
- An iPhone X, XS, XS Max or XR that says storage is full has a fixed capacity: Apple lists 64 or 256 GB for the X, 64, 256 or 512 GB for the XS and XS Max, and 64, 128 or 256 GB for the XR, with no card slot. Apple's photo storage article gives the order: check space under Settings, General, iPhone Storage, turn on iCloud Photos with Optimize iPhone Storage so full-resolution originals sit in iCloud, and delete what you do not need. On a phone that no longer takes new iOS versions, freeing space also keeps the last update installable.
- Storage by model
- iPhone X: 64 or 256 GB. XS and XS Max: 64, 256 or 512 GB. XR: 64, 128 or 256 GB. Per Apple's model page and Wikipedia.
- What to move first
- Photos and video, then apps you no longer use, then offline downloads, following Apple's order.
- Part numbers
- Model numbers such as A1901 (X), A2097 (XS), A2101 (XS Max) and A2105 (XR). Storage is not a replaceable part and no owner part number is involved.
- Tools and supplies
- A computer and Lightning cable, or an iCloud plan with room. A dry towel keeps the phone clean while you work.
- Repair cost
- Storage is not a repair item. iFixit's table lists an $89 battery and screens at $199 to $329, but a full-storage fault is solved by clearing files.
- Other models this page answers
- These steps also fit the iPhone X.
Stop boundary
When this stops being a self-service repair
- !If storage stays full after a cleanup and a restart, contact Apple Support before deleting more
- !If iCloud will not sync, check your iCloud plan and Wi-Fi before deleting local photos
- !If you need more permanent room, choose a larger iCloud plan; the phone has no card slot
Evidence ledger
Sources behind this answer
Checking storage, iCloud Photos, Optimize Storage, iCloud plans and recommendations.
Model numbers and capacities for the iPhone X, XS, XS Max and XR.
iPhone X battery, OLED display, A11 chip, IP67, Qi charging and iOS versions.
iPhone XS and XS Max batteries, A12 chip, IP68, Wi-Fi and iOS support.
iPhone XR battery, LCD display, IP67 and iOS support.
Exact questions
Common questions
What is System Data on the Storage screen?+
It is space used by iOS, caches and other data that is not a photo, app or document. Apple's Storage screen shows it but you cannot clear it by hand; a restart and clearing app caches shrink it a little.
How often should I check Storage?+
Every month or two, since photos and app data grow quietly. Apple's Storage screen lists recommendations you can act on before the phone reaches full.
storage full: model differences
Also covered: Apple iPhone 13 family; Apple iPhone 12 family.