Clear the cache
To clear cached data from a single or specific program, just go to Settings> Applications>Application Manager and tap on the app, of which the cached data you want to remove. In the information menu, tap on Storage and then “Clear Cache” to remove the relative cached files.
Remove videos, books, and music stored on your phone
Sometimes what's taking up the most amount of storage are the data and documents stored within an app on your phone. You can find out if that's the case by once again heading to Settings > General > iPhone Storage and then clicking on an app.
Your iPhone memory is full and you can no longer save new apps, photos, and other data on your iPhone. It also means iOS can no longer delete cache data and other system files to clear up storage on your iPhone.
Empty Android's cached files
If you've deleted all the files you don't need and you're still receiving the “insufficient storage available” error message, you need to clear out Android's cache.
If you're ready to free up space, tap Delete # items. Open the iPhone or iPad Photos app (not the Google Photos app). Tap Recently Deleted and delete those same photos and videos.
Available disk spaces does not increase after deleting files on an external drive. When a file is deleted, the space used on the disk is not reclaimed until the file is truly erased. The trash (recycle bin on Windows) is actually a hidden folder located in each hard drive.
A common reason for this issue revolves around the Recently Deleted album in the Photos app. This album allows you to recover deleted photos and videos for up to 30 days after deleting them. Like the Recycle Bin on your computer, it acts as a temporary safety net in case you change your mind.
And your device can fill up quickly depending on the size of its storage capacity and how much content you have. If you see a message that your device's storage is full, you can free up space by using iCloud Photos or deleting content on your device.
Optimize your iPhone photos and videos
By default, every time you take a photo or video, it is saved in full resolution on your device. If you're capturing photos and videos in the highest resolution possible, they can take up quite a bit of space.
Clearing your cache removes stored data that helps websites and apps open faster, while offloading temporarily uninstalls an app without deleting any of the documents and data associated with that app. Both methods can help speed up iPhones that are slowed down by low storage.
Delete Emails Sooner
The items that are waiting to be deleted take up space on your phone, so if you delete them sooner, you'll free up space faster. To change that setting: Open the Settings app and select Passwords & Accounts. Then, tap the email account whose setting you want to change.
Yes, emails can take up storage on your phone. Depending on the type, size, and number of emails associated with your phone, emails can quickly consume storage. This can be especially true if you're downloading large attachments, or if you're not regularly clearing your inbox.
Sometimes the "Android storage space running out but it's not" issue is caused by the overwhelming amount of data stored on your phone's internal memory. If you have many apps on your Android device and use them simultaneously, cache memory on your phone can be blocked, which leads to Android insufficient storage.
First, identify any unused apps that are eating up memory and causing your smartphone to lag. Permanently delete them to get more storage space and improve your phone's processing speed.
Find out what files are taking up space on Windows 10
Open Settings on Windows 10. Click on System. Click on Storage. Under the “(C:)” section, you will see what's taking up space on the main hard drive. Click the “Show more categories” option to view the storage usage from other file types.
In Storage > Apps, you can see how much space apps take up. It's a good idea to clear your cache to save space. (Note for newbies: it is usually safe to clear the cache. However, before you hit “Clear storage,” check to see what your user data is.
If you delete a photo or video that's backed up in Google Photos, it will stay in your trash for 60 days. If you delete an item from your Android 11 and up device without it being backed up, it will stay in your trash for 30 days.