Remove OTA installed iOS 8 and reinstall on itunes hey guys i have the iOS 8.1 update on my iPhone 5s. I have downloaded iOS 8 over-the-air and it takes up too much storage space. So I was wondering if it is possible to delete that update to go back to iOS 7 and re-download iOS 8 on itunes so it can take up less space.....
There is no difference in space required after the upgrade whether you upgrade iOS over the air or via iTunes. The only known problem is that you need more free space on your iOS device before/during the upgrade if you do it over the air. But as you already seem to have downloaded the upgrade to your phone this doesn't seem to be an issue for you, so just apply the upgrade on the phone and you are done.