There’s never enough storage space on your iPhone or iPad, especially when you need it the most. Before heading out for a trip or recording a long video, it’s best to check available storage space on your iOS device.
How to Check How Much Space You Have Left
To find out the free storage space on your iPhone or iPad, open the Settings app. Tap on “General” and then select “iPhone Storage” (or “iPad Storage” if that’s what you’re using).
At the top of the screen, you’ll see the used space on your iPhone or iPad. To find out the available space, subtract the used space from the total storage capacity. For the screenshot below, that would be 64 GB minus 22 GB, which is 42 GB available storage space.
The graph gives a visual overview of how the storage space is being used.
How to Free up Storage Space
Running out of room on your iPhone or iPad? There are a couple of ways you can free up storage space. You might be familiar with the usual suggestions: delete photos and apps.
But if you’ve already done that (or if you’re unwilling to curb your photo library), try some of the options below.
Enable iCloud Photos
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Source : How to Check Available Storage on an iPhone or iPad