| Clue | Source | Date |
|---|---|---|
| Feature in a telephone directory | New York Times | 03 Feb 2018 |
| Feature in a telephone directory | ||
| Telemarketing reference | Newsday | 13 Aug 2016 |
| Graphic with three-digit numbers | LA Times Daily | 20 Jun 2015 |
| Graphic with three-digit numbers | ||
| Phone book feature | ||
| Verizon reference |