I'm reading out of order, so I'm starting on "Understand". Two things strike me starting off the bat: I would NEVER admit to memorizing those 14 digits so fast and well as to recall them backwards (I realize that I might be a paranoid "too-genre-savvy" book-worm, but still); and (given that phone-call) this guy is about to find out what a social curse true high intellect is.
Aaaannnd right after the guy asks for it. Goodness! This guy has never read or watched any sci-fi, or wish-fulfillment stories.