I have more then enough extra space but my phone storage always showing full
Who can backup more stuff to my iCloud
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Did you check, what exactly is filling up the storage space on your iPhone?
How to check the storage on your iPhone, iPad, and iPod touch - Apple Support
Are you using iCloud Photos?
In that case, saving photos to iCloud Photos will not reduce your storage space on the phone significantly.
You may gain some space, if you select to "optimise" the size of the photos on your phone.