| Clue | Source | Date |
|---|---|---|
| Protection from annoying rings | The New Yorker | 18 Mar 2019 |
| Numbers to avoid | New York Times | 02 Sep 2018 |
| Numbers to avoid | ||
| Consequence of the telemarketing boom | LA Times Daily | 23 Oct 2016 |
| Consequence of the telemarketing boom | ||
| Names on it are off-limits to telemarketers | ||
| Names on it are off-limits to telemarketers |