In addition to the iPhone system itself, there is also a large part of the space for various installation packages, App cache, etc. This part of the content occupies more and more space over time, and eventually reaches a certain memory, you will be prompted to storage full. As these occupied memory is "System", many people usually ignore it.

There are many hidden files on your iPhone like App caches, corrupted files, crash logs, etc. These useless junk files will occupy precious storage space, makes the iOS lag and to be sluggish. Hence, if iPhone says there is not enough storage, but you check and found nothing, all these invisible iPhone junk files may be the reason!

The top reason for this problem is due to System Memory. This System Memory is a portion of the iPhone which takes a significant amount of memory space consisting of essential system files that are significant in the functionality and performance of the device. Such essential files include backups, cached items, installation packages, and logs.

Why do you need more storage? Photos and videos in particular take up a lot of space, along with podcasts, music, and large apps such as games. If you’re a light-duty iPhone user that typically just uses it to make calls, text people, send emails, and browse the web, you can potentially get by with less storage space on your iPhone.