Confirm what? Confirm that there will be available storage space after the update? If so, yes, but how much depends on what’s already taking up local storage space.
What If the phone is brand new and updated to iOS 11.0.3 without installing any apps, no photos or any other media. How much space do I have for usage then?
What If the phone is brand new and updated to iOS 11.0.3 without installing any apps, no photos or any other media. How much space do I have for usage then?