The free third-party Spam-Call Scrubber skill is at https://t.co/CS0D72lOBH. Open the page and click Add to Grok Bot (accept terms). Then in the Grok Bot app on an eligible plan, privately share only your number. It searches people-search and data-broker sites, files opt-outs, handles confirmations, and rechecks on your schedule. It is not in the default plugin catalog, so it must be added via that link.