How Can I Lookup By Phone Number

Last night I was happened to meet one of my old class fellows who used to be a very responsible and well aware student of our class. After talking to him for a while I get to know about his kids kidnapping case. I can feel the threat and pain on his face of losing his baby .He was passing by a police station and was holding a phonebook directory. On enquiring it was revealed to me that he has waited so much money and time on tracing the phone number of kidnapper. Even then has not reached to the suspect. The police officers were just dragging him and the phonebook directory was of local area (the kidnapper was situated outside the city)