Often companies request an initial telephone interview before inviting you in for a face to face meeting in order to get a better understanding of the type of candidate you are. The one benefit of this is that you can have your notes out in front of you. You should do just as much preparation as you would for a face to face interview, and remember that your first impression is vital. Some people are better meeting in person than on the phone, so make sure that you speak confidently, with good pace and try to answer all the questions that are asked.