The more we use Windows Phone 8.1, the more we discover such as the changes to our call history. For starters, we now have a Speed Dial page that sits alongside the History and Voice Mail pages. You also have the ability to pull up call details that reveal the date, time and duration of the calls.
Finally, the History page now groups calls from the same caller, based on the date, to avoid repetition. For example if Rich had called my Windows Phone four times today, the history would display ?Rich Edmonds (4)? instead of four entries for those calls.
Full story from the WPCentral blog...