In the movie wargames How did David stumble on the phone number to the NORAD computer?

Answer 1

In the movie "WarGames," David Lightman, played by Matthew Broderick, stumbles upon the phone number for the NORAD computer while attempting to hack into a game company’s system. He discovers a backdoor into the system by using a list of phone numbers from a directory he finds in his school’s computer. This leads him to connect with the NORAD system, mistakenly believing he is accessing a video game, which ultimately triggers a series of events involving nuclear war simulations.