This is an issue I have experienced pretty much since day one, when I got my iPhone 4 in 2010, but I thought it was high time to write a post about it. Forgive me if somebody else has already done so. When I am on Safari or in an app where the on screen keyboard is presented for form field entry, If I drag my finger around on the screen, say, to get a better understanding of the form layout, I find that when I return to where the keyboard should be, it has been hidden. The field I was editing still has focus, yet the keyboard vanishes for some reason I don't understand. Is this supposed to happen or is this a bug?