In my experience it depends on who is the caller. Sometimes some have to do a truckload of followup questions is not feasible to do in an email I reckon it happens when the caller is someone intelligent with a knowledgeable background. Many times I end up repeating the very fucking same thing of the mail 3 or 4 times this happens with suckers that got the position by sucking and don't understand jack shit about what I do. Today coincidentally and sadly I have some of the second. And I wish I would turn this into a fist fight.