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Or just having your phone die and needing to call someone for a ride. Of course, then you need their number memorized, which is less common now.

• Minor49er 4y ago
  It was common for phone booths to have copies of the yellow and white pages, though it was also common for people to just go in and tear up the pages
• lizknope 4y ago
  I keep a small printout in my wallet with 20 phone numbers just for that situation.