I am my boss’ phone directory. I mean he expects me to know all the phone numbers of people we are in contact with, so I make it a point to remember them, sometimes even when I’m home he’ll call and ask for someone’s number. Of course I have my own directory too just in case I forgot. Yellow pages is a must for me. Online directories are very popular now a day. It is so nice that I can Search Area Codes anytime and not only phone numbers but with additional information as well.