VGFacts

https://www.reddit.com/r/Fallout/comment...4vaulttec/

Supposedly, you can find one of those phone numbers that plays a message in the game. Anyone wanna report back with a recording? Comments said it was in Fallout 3 and OP says its in 4.

Beat you to the punch there
http://www.vgfacts.com/trivia/6985/

Alright. If you want, feel free to submit the Fallout 4 one as well.