I phone storage full message is coming on this phone
The iPhone storage full message coming on the screen
iPhone 6s, iOS 13
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Well that means that the physical storage on the phone has been used up. You need to delete content to get rid of the message. Some of the suggestions in here might help.
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
If the bulk of the storage is being taken up by “other”, see this.
Clear Other storage on your iPhone or iPad - Apple Support