IOS update downloaded, but not updating on my iPhone?

I'm no longer getting that all downloads have been paused, so I'm sure the update has downloaded, but I still keep getting the error message "iPhone could not be updated. The disk you are attempting to use it full." I have no idea what it wants from me.

Is your iphone jailbroken?
if it is then that is obvious because updating your iphone deletes everything and cydia can't be uninstalled by updating your iphone.
if you want to update it first format your iphone then try updating i'm sure it will work!

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