My daughter has her iPhone 4 on iOS 6 because it's a little snappier than iOS 7. However, somehow her phone auto-downloaded iOS 7. All is not lost because it won't automatically install unless you specifically give it permission. But the problem is, iOS 7 is a 2GB file and I don't see any way to delete it to recover that lost room. Does anyone know how to delete the iOS 7 download and recover that 2gb of space?