Unfortunately the phone book in iPhone is not the most convenient. All calls, both incoming and outgoing, are dumped into one list as in a mass grave. Even in ancient phones, there was more opportunity to work with call logs. I think everyone has a lot of wishes for what they would like to improve there. Here is an unplowed field for programs implementing these missing functions. And oddly enough, there are very few such utilities. Three fingers are enough to count everything. CallD is one of these, allows you to edit call logs. More precisely, it has one function – to delete a phone number from history. I know from myself that by getting rid of one number, you can avoid lengthy explanations about who, where, why.